{"title":"Blue Gemstones","description":"\u003cp\u003eBlue is the most collected color in gemstones, and no two species hold it the same way. Our blue gemstones include natural sapphire from Sri Lanka, Montana’s Yogo Gulch and Australia, vivid tanzanite, brilliant Cambodian blue zircon and aquamarine from a few carats to over 39.\u003c\/p\u003e\u003cp\u003eEvery loose gemstone here is chosen one at a time and documented with its own Digital Gem Passport; rated stones carry an \u003ca href=\"\/pages\/otzera-50\"\u003eOtzera 50\u003c\/a\u003e score judged against their own species. New to blue? Start with our \u003ca href=\"\/pages\/sapphire\"\u003esapphire guide\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"1-27-ct-unheated-cambodian-royal-blue-sapphire","title":"1.27 ct Unheated Cambodian Royal Blue Sapphire","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA richly saturated natural sapphire with intense vivid-blue color and a refined antique oval silhouette. This 1.27 ct stone combines strong transparency, documented Cambodian origin and an unheated condition, with a Professional Gem Sciences Laboratory “PGS-type Royal Blue” color designation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Sapphire\u003cbr\u003eSpecies: Corundum\u003cbr\u003eWeight: 1.27 ct\u003cbr\u003eShape \/ Cut: Oval Mixed Cut\u003cbr\u003eMeasurements: 6.38 × 5.56 × 4.06 mm\u003cbr\u003eColor: Vivid Blue\u003cbr\u003eSpecial Color Designation: PGS-type Royal Blue\u003cbr\u003eTransparency: Transparent\u003cbr\u003eClarity Grade: Slightly Included\u003cbr\u003ePolish: Very Good\u003cbr\u003eSymmetry: Very Good\u003cbr\u003eOverall Cut Grade: Very Well Made\u003cbr\u003eGeographic Origin: Cambodia\u003cbr\u003eTreatment: None — no gemological evidence of heat present\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTreatment \u0026amp; Origin Disclosure\u003c\/strong\u003e\u003cbr\u003eProfessional Gem Sciences Laboratory identified the sapphire as Cambodian in origin and reported no gemological evidence of heat treatment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eLaboratory Documentation\u003c\/strong\u003e\u003cbr\u003eAccompanied by Professional Gem Sciences Laboratory Report No. 44080102, dated October 11, 2019.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eSapphire is highly durable and well suited to jewelry wear. Clean with warm water, mild soap and a soft brush.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details, laboratory documentation, treatment and origin disclosures.\u003c\/p\u003e","brand":"otzera","offers":[{"title":"Default Title","offer_id":50974865490167,"sku":"7326518","price":2450.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/1-27-ct-cambodian-royal-blue-sapphire-angle-2_97ec3f4f-bb46-45cf-9db6-05afdd3e6d99.jpg?v=1787653431"},{"product_id":"2-41-ct-unheated-australian-blue-sapphire","title":"2.41 ct Unheated Australian Blue Sapphire — GIA Report","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eThis distinctive 2.41 ct natural sapphire from Australia is fashioned as a cushion sugarloaf cabochon, giving it a sculptural high-domed profile and softly rounded square outline. Its appeal combines a distinctive cabochon form, documented Australian origin and an unheated treatment status.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Sapphire\u003cbr\u003eSpecies: Natural Corundum\u003cbr\u003eWeight: 2.41 ct\u003cbr\u003eShape \/ Cut: Cushion Sugarloaf Cabochon\u003cbr\u003eMeasurements: 7.33 × 7.28 × 4.56 mm\u003cbr\u003eColor: Blue\u003cbr\u003eTransparency: Transparent\u003cbr\u003eOrigin: Australia\u003cbr\u003eTreatment: No indications of heating\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTreatment \u0026amp; Origin Disclosure\u003c\/strong\u003e\u003cbr\u003eGIA describes the stone as transparent blue natural corundum of Australian geographic origin and reports no indications of heating.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eLaboratory Documentation\u003c\/strong\u003e\u003cbr\u003eAccompanied by GIA Sapphire Origin Report No. 5201859064, dated February 1, 2020.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eSapphire is highly durable and suitable for jewelry wear. Clean with warm water, mild soap and a soft brush.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details, GIA documentation, and treatment and origin disclosures.\u003c\/p\u003e","brand":"otzera","offers":[{"title":"Default Title","offer_id":50983384285431,"sku":"3509645","price":2150.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/otzera-2-41ct-australian-blue-sapphire-sugarloaf-front_b16d7dd7-5a50-4b18-a514-412a8e23d3cc.jpg?v=1789010235"},{"product_id":"2-30-ct-blue-sapphire","title":"2.30 ct Blue Sapphire","description":"\u003cp\u003eThis richly colored natural sapphire weighs \u003cstrong\u003e2.30 carats\u003c\/strong\u003e and displays a dark, slightly over-saturated blue. Cut into a classic oval mixed shape, the stone combines a refined outline with crisp faceting that draws light across its surface and emphasizes its dramatic color.\u003c\/p\u003e\n\u003cp\u003eMeasuring \u003cstrong\u003e9.08 × 6.88 × 4.32 mm\u003c\/strong\u003e, the sapphire has an attractive face-up presence and balanced proportions. \u003c\/p\u003e\n\u003cp\u003eThe stone has undergone \u003cstrong\u003eheat treatment\u003c\/strong\u003e, the widely accepted enhancement used in the sapphire market to improve color. \u003c\/p\u003e\n\u003ch3\u003eGemstone Details\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone:\u003c\/strong\u003e Natural Blue Sapphire\u003cbr\u003e\u003cstrong\u003eSpecies:\u003c\/strong\u003e Corundum\u003cbr\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 2.30 carats\u003cbr\u003e\u003cstrong\u003eShape:\u003c\/strong\u003e Oval Mixed Cut\u003cbr\u003e\u003cstrong\u003eMeasurements:\u003c\/strong\u003e 9.08 × 6.88 × 4.32 mm\u003cbr\u003e\u003cstrong\u003eColor:\u003c\/strong\u003e Dark Blue\u003cbr\u003e\u003cstrong\u003ePolish:\u003c\/strong\u003e Very Good\u003cbr\u003e\u003cstrong\u003eSymmetry:\u003c\/strong\u003e Very Good\u003cbr\u003e\u003cstrong\u003eOverall Cut Grade:\u003c\/strong\u003e Very Well Made\u003cbr\u003e\u003cstrong\u003eEnhancement:\u003c\/strong\u003e Heat\u003cbr\u003e\u003cstrong\u003eStability:\u003c\/strong\u003e Excellent\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003eOtzera Collector’s Note\u003c\/h3\u003e\n\u003cp\u003eWhile overdark and heat enhanced, this sapphire weighs over two carats making it a solid entry level sapphire for new collectors looking to build their collections.\u003c\/p\u003e","brand":"otzera","offers":[{"title":"Default Title","offer_id":50983409746167,"sku":"6230574","price":350.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/2.30sapphire6.png?v=1786018865"},{"product_id":"aquamarine-otz-2026-01628","title":"3.22 ct Blue Emerald-Cut Aquamarine","description":"\u003cp\u003eBright blue color and a classic emerald cut give this 3.22 ct aquamarine a crisp, elegant look with strong face-up presence. Minor windowing and extinction, light polish issues, and a small pavilion feather are reflected in its Otzera 50 evaluation. Otzera 50: 36\/50 - Distinguished.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTreatment\u003c\/strong\u003e\u003cbr\u003eHeated (standard for aquamarine). Most aquamarine is gently heated to clear a faint green or yellow tint and leave a purer blue. The change is permanent and needs no special care.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51034350420215,"sku":"OTZ-2026-01628","price":965.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01628-b.jpg?v=1786962925"},{"product_id":"2-32-ct-natural-green-sapphire","title":"2.32 ct Green Round Brilliant Sapphire","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eThis 2.32 ct sapphire is defined by its unusually clean appearance and precise round brilliant cutting. Its body color is predominantly green, with a subtle blue influence visible from certain angles, giving the stone a distinctive and shifting face-up character.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eGemstone:\u003c\/strong\u003e Natural Green Sapphire\u003cbr\u003e\u003cstrong\u003eSpecies:\u003c\/strong\u003e Corundum\u003cbr\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 2.32 ct\u003cbr\u003e\u003cstrong\u003eShape \/ Cut:\u003c\/strong\u003e Round Brilliant\u003cbr\u003e\u003cstrong\u003eMeasurements:\u003c\/strong\u003e 7.70–7.76 × 5.05 mm\u003cbr\u003e\u003cstrong\u003eTreatment:\u003c\/strong\u003e Heated\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eOtzera 50:\u003c\/strong\u003e 33\/50 — Collectible\u003cbr\u003e\u003cstrong\u003eFace-Up Performance:\u003c\/strong\u003e 75%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51137217167607,"sku":"OTZ-2026-01640","price":890.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01640-green-sapphire-4.png?v=1789009101"},{"product_id":"1-57-ct-natural-purple-sapphire","title":"1.57 ct Unheated Sri Lankan Purple Sapphire","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA lively purple sapphire with excellent clarity and the added appeal of untreated status and Sri Lankan provenance. At 1.57 carats, its oval modified brilliant cut gives the stone a bright, energetic face-up appearance, while only a minor fingerprint near the periphery is noted in the evaluation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eGemstone:\u003c\/strong\u003e Natural Purple Sapphire\u003cbr\u003e\u003cstrong\u003eSpecies:\u003c\/strong\u003e Corundum\u003cbr\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.57 ct\u003cbr\u003e\u003cstrong\u003eShape \/ Cut:\u003c\/strong\u003e Oval Modified Brilliant\u003cbr\u003e\u003cstrong\u003eMeasurements:\u003c\/strong\u003e 7.56 × 6.36 × 4.09 mm\u003cbr\u003e\u003cstrong\u003eOrigin:\u003c\/strong\u003e Sri Lanka\u003cbr\u003e\u003cstrong\u003eTreatment:\u003c\/strong\u003e None\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eOtzera 50:\u003c\/strong\u003e 37\/50 — Distinguished\u003cbr\u003e\u003cstrong\u003eFace-Up Performance:\u003c\/strong\u003e 75%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51137217790199,"sku":"OTZ-2026-01639","price":1560.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01639-purple-sapphire-3.png?v=1789009463"},{"product_id":"aquamarine-otz-2026-01638","title":"9.05 ct Natural Nigerian Aquamarine","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eAt 9.05 carats, this Nigerian aquamarine offers impressive presence in a cushion modified brilliant cut. Its cool blue appearance and substantial size make it an appealing collector stone with the scale to work equally well in a statement setting.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Aquamarine\u003cbr\u003eSpecies: Beryl\u003cbr\u003eWeight: 9.05 ct\u003cbr\u003eShape \/ Cut: Cushion Modified Brilliant\u003cbr\u003eMeasurements: 15.52 × 11.70 × 8.34 mm\u003cbr\u003eOrigin: Nigeria\u003cbr\u003eTreatment: Heated (standard for aquamarine)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003eOtzera 50: 37\/50 — Distinguished\u003cbr\u003eFace-Up Performance: 68%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTreatment\u003c\/strong\u003e\u003cbr\u003eMost aquamarine is gently heated to clear a faint green or yellow tint and leave a purer blue. The change is permanent and needs no special care.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eAquamarine is generally suitable for jewelry wear. Clean with warm water, mild soap and a soft brush; avoid harsh chemicals and thermal shock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51138651226359,"sku":"OTZ-2026-01638","price":3150.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01638-aquamarine-3.jpg?v=1789008057"},{"product_id":"blue-sapphire-otz-2026-01644","title":"1.47 ct Unheated Yogo Sapphire — GIA Origin Report","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA rare American sapphire from Montana's famed Yogo Gulch, this 1.47 ct natural blue sapphire combines strong saturation and high transparency with the collector appeal of GIA-confirmed origin and no indications of heating. Faceted Yogo sapphires above one carat are notably scarce, making its size and locality the defining features of this stone.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Blue Sapphire\u003cbr\u003eSpecies: Corundum\u003cbr\u003eWeight: 1.47 ct\u003cbr\u003eShape \/ Cut: Oval Modified Brilliant Cut\u003cbr\u003eMeasurements: 7.10 × 6.46 × 3.61 mm\u003cbr\u003eColor: Blue\u003cbr\u003eTransparency: Transparent\u003cbr\u003eOrigin: USA (Yogo Gulch), Montana\u003cbr\u003eTreatment: No indications of heating\u003cbr\u003eCondition: Surface scratches and abrasions are present; professional repolishing is recommended.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003eOtzera 50: 36\/50 — Distinguished\u003cbr\u003eFace-Up Performance: 70%\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTreatment \u0026amp; Origin Disclosure\u003c\/strong\u003e\u003cbr\u003eGIA determined the geographic origin to be USA (Yogo Gulch) and reported no indications of heating.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eLaboratory Documentation\u003c\/strong\u003e\u003cbr\u003eAccompanied by GIA Sapphire Origin Report No. 5221467846, dated June 8, 2022.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eProvenance \/ Collector Significance\u003c\/strong\u003e\u003cbr\u003eYogo sapphires are prized for their highly specific Montana provenance and are typically encountered in small sizes. A faceted Yogo above one carat is particularly uncommon, giving this stone meaningful locality and size appeal for collectors of American gemstones.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eSapphire is durable for jewelry wear, but this stone currently shows notable facet-surface wear. Professional repolishing is recommended before setting. If repolished, the stone should be reweighed and remeasured and its documentation reviewed for consistency.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details, GIA documentation, treatment and origin disclosures, condition notes and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51150481522935,"sku":"OTZ-2026-01644","price":9850.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01644-yogo-sapphire-1.jpg?v=1789159424"},{"product_id":"blue-green-otz-2026-01646","title":"2.98 ct Namibian Lagoon Tourmaline","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA nearly three-carat natural Lagoon tourmaline with a saturated blue-green appearance and an unusual buff-top cutting style. Its oval outline carries broad flashes of green and teal as the stone moves in the light, while the 2.98 ct size gives it strong visual presence.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Lagoon Tourmaline\u003cbr\u003eSpecies: Tourmaline\u003cbr\u003eWeight: 2.98 ct\u003cbr\u003eShape \/ Cut: Oval Buff Top Modified Brilliant Cut\u003cbr\u003eMeasurements: 10.00 × 8.47 × 5.87 mm\u003cbr\u003eOrigin: Namibia\u003cbr\u003eTreatment: None\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003eOtzera 50: 33\/50 — Collectible\u003cbr\u003eFace-Up Performance: 75%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTreatment\u003c\/strong\u003e\u003cbr\u003eTourmaline comes in more colors than almost any other gem, and this stone’s color is natural.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eTourmaline is suitable for jewelry wear with sensible care. Clean with warm water, mild soap and a soft brush; avoid sudden temperature changes and aggressive cleaning methods.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51150481719543,"sku":"OTZ-2026-01646","price":2980.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01646-blue-green-tourmaline-1.jpg?v=1789159236"},{"product_id":"4-06-ct-ceylon-blue-sapphire-gia-origin-report","title":"4.06 ct Ceylon Blue Sapphire — GIA Origin Report","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA substantial 4.06 ct natural blue sapphire from Sri Lanka with a classic cushion mixed cut and strong face-up presence. Its saturated blue appearance, excellent transparency and documented Ceylon origin make provenance and size meaningful parts of its collector appeal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Blue Sapphire\u003cbr\u003eSpecies: Natural Corundum\u003cbr\u003eWeight: 4.06 ct\u003cbr\u003eShape \/ Cut: Cushion Mixed Cut\u003cbr\u003eMeasurements: 9.92 × 7.16 × 5.41 mm\u003cbr\u003eOrigin: Sri Lanka (Ceylon)\u003cbr\u003eTreatment: Heated\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003eOtzera 50: 39\/50 — Distinguished\u003cbr\u003eFace-Up Performance: 80%\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTreatment \u0026amp; Origin Disclosure\u003c\/strong\u003e\u003cbr\u003eGIA Sapphire Origin Report 1216818065 identifies the stone as natural corundum, blue sapphire, of Sri Lankan geographic origin, heated.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eLaboratory Documentation\u003c\/strong\u003e\u003cbr\u003eAccompanied by GIA Sapphire Origin Report No. 1216818065, dated June 30, 2021.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eSapphire is highly durable and suitable for everyday jewelry with normal care. Clean with warm water, mild soap and a soft brush.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details, origin and treatment disclosures, and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51159530766583,"sku":"OTZ-2026-01654","price":8900.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01654-ceylon-blue-sapphire-1.jpg?v=1789354081"},{"product_id":"1-20-ct-brazilian-blue-green-tourmaline","title":"1.20 ct Brazilian Blue-Green Tourmaline","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA natural blue-green tourmaline from Brazil with an oval modified brilliant cut and an attractive balance of blue and green. At 1.20 ct, its transparent appearance and lively mixed color give it an easy, versatile collector appeal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Blue-Green Tourmaline\u003cbr\u003eSpecies: Natural Tourmaline\u003cbr\u003eWeight: 1.20 ct\u003cbr\u003eShape \/ Cut: Oval Modified Brilliant Cut\u003cbr\u003eMeasurements: 7.38 × 6.14 × 3.96 mm\u003cbr\u003eOrigin: Brazil\u003cbr\u003eTreatment: None\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003eOtzera 50: 34\/50 — Collectible\u003cbr\u003eFace-Up Performance: 75%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTreatment\u003c\/strong\u003e\u003cbr\u003eTourmaline comes in more colors than almost any other gem, and this stone’s color is natural.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eTourmaline is suitable for jewelry wear with sensible care. Clean with warm water, mild soap and a soft brush; avoid ultrasonic cleaning, harsh chemicals and sudden temperature changes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51159592698103,"sku":"OTZ-2026-01650","price":760.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01650-blue-green-tourmaline-1.jpg?v=1789355587"},{"product_id":"6-75-ct-pear-cut-tanzanite","title":"6.75 ct Pear-Cut Tanzanite","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA substantial 6.75 ct natural tanzanite with a pear-shaped mixed cut and rich violet-blue appearance. Its generous size gives the stone strong presence, while the rounded pear outline and bright flashes across the crown make it especially suited to a statement ring or pendant.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Tanzanite\u003cbr\u003eSpecies: Zoisite\u003cbr\u003eWeight: 6.75 ct\u003cbr\u003eShape \/ Cut: Pear Mixed Cut\u003cbr\u003eMeasurements: 11.61 × 10.66 × 8.10 mm\u003cbr\u003eOrigin: Tanzania\u003cbr\u003eTreatment: Heated (standard for tanzanite)\u003cbr\u003eCondition: Some facet abrasion is present\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003eOtzera 50: 36\/50 — Distinguished\u003cbr\u003eFace-Up Performance: 80%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTreatment\u003c\/strong\u003e\u003cbr\u003eTanzanite is gently warmed after mining to bring out its blue-violet color. This has been standard practice since the gem was found in Tanzania in 1967, and it is how all tanzanite is valued. The color is permanent and stable and needs no special care.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eTanzanite is best suited to thoughtful wear. Clean with warm water, mild soap and a soft brush; avoid ultrasonic cleaning, sharp impacts and sudden temperature changes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51187941736695,"sku":"OTZ-2026-01661","price":3650.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01661-tanzanite-1_3b66cd36-4462-4b79-8a37-d4da55d99344.jpg?v=1789846225"},{"product_id":"australian-boulder-opal-suite-matched-pair-crescent","title":"Australian Boulder Opal Suite — Matched Pair + Crescent","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA distinctive three-piece Australian boulder opal suite combining a matched pair of rounded cabochons with a larger crescent-shaped centerpiece. Natural ironstone matrix frames flashes of green, blue, yellow and orange play-of-color, giving each piece an organic pattern while the suite reads as a cohesive set.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Boulder Opal Suite\u003cbr\u003eSpecies: Opal\u003cbr\u003ePieces: Three — matched pair plus crescent centerpiece\u003cbr\u003eCut: Cabochon\u003cbr\u003eCenterpiece Measurements: 36.0 × 11.3 × 4.2 mm\u003cbr\u003eMatched Pair Measurements: Approximately 15.9 × 15.0 × 5.6 mm each\u003cbr\u003eColor: Orange, green, blue and yellow play-of-color\u003cbr\u003eOrigin: Australia\u003cbr\u003eTreatment: None\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProvenance \/ Collector Significance\u003c\/strong\u003e\u003cbr\u003eThe natural matrix patterns give the suite one-of-a-kind character, while the coordinated shapes make it especially appealing for a bespoke jewelry composition or as a complete collector set.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eOpal requires gentler care than crystalline gemstones. Keep away from high heat, harsh chemicals and sharp impacts, and clean only with a soft damp cloth or mild soapy water.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving the suite's identifying details.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51188069728503,"sku":"OTZ-2026-00328","price":2950.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-00328-boulder-opal-suite-1.jpg?v=1789851426"},{"product_id":"1-44-ct-tanzanian-tanzanite","title":"1.44 ct Tanzanite","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA lively 1.44 ct natural tanzanite from Tanzania with a classic oval modified brilliant cut and an appealing blue-violet appearance. Its transparent body and crisp oval outline make it an easy size for jewelry while retaining the distinctive color character that makes tanzanite so recognizable.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eGemstone:\u003c\/strong\u003e Natural Tanzanite\u003cbr\u003e\u003cstrong\u003eSpecies:\u003c\/strong\u003e Zoisite\u003cbr\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.44 ct\u003cbr\u003e\u003cstrong\u003eShape \/ Cut:\u003c\/strong\u003e Oval Modified Brilliant\u003cbr\u003e\u003cstrong\u003eMeasurements:\u003c\/strong\u003e 8.35 × 6.49 × 3.99 mm\u003cbr\u003e\u003cstrong\u003eOrigin:\u003c\/strong\u003e Tanzania\u003cbr\u003e\u003cstrong\u003eTreatment:\u003c\/strong\u003e Heated (standard for tanzanite)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eOtzera 50:\u003c\/strong\u003e 32\/50 — Collectible\u003cbr\u003e\u003cstrong\u003eFace-Up Performance:\u003c\/strong\u003e 70%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTreatment\u003c\/strong\u003e\u003cbr\u003eTanzanite is gently warmed after mining to bring out its blue-violet color. This has been standard practice since the gem was found in Tanzania in 1967, and it is how all tanzanite is valued. The color is permanent and stable and needs no special care.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eTanzanite is best suited to thoughtful wear. Clean with warm water, mild soap and a soft brush; avoid ultrasonic cleaning, sharp impacts and sudden temperature changes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51188069957879,"sku":"OTZ-2026-01664","price":425.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01664-tanzanite-replacement-1.jpg?v=1790472856"},{"product_id":"2-08-ct-tanzanian-tanzanite","title":"2.08 ct Tanzanite","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA richly saturated 2.08 ct natural tanzanite with the deep blue-violet color that gives the variety its unmistakable appeal. The oval modified brilliant cut produces lively flashes across the face, while the two-carat size gives the stone a strong presence without becoming oversized for jewelry.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eGemstone:\u003c\/strong\u003e Natural Tanzanite\u003cbr\u003e\u003cstrong\u003eSpecies:\u003c\/strong\u003e Zoisite\u003cbr\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 2.08 ct\u003cbr\u003e\u003cstrong\u003eShape \/ Cut:\u003c\/strong\u003e Oval Modified Brilliant\u003cbr\u003e\u003cstrong\u003eMeasurements:\u003c\/strong\u003e 8.84 × 6.82 × 4.90 mm\u003cbr\u003e\u003cstrong\u003eOrigin:\u003c\/strong\u003e Tanzania\u003cbr\u003e\u003cstrong\u003eTreatment:\u003c\/strong\u003e Heated (standard for tanzanite)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eOtzera 50:\u003c\/strong\u003e 36\/50 — Distinguished\u003cbr\u003e\u003cstrong\u003eFace-Up Performance:\u003c\/strong\u003e 83%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTreatment\u003c\/strong\u003e\u003cbr\u003eTanzanite is gently warmed after mining to bring out its blue-violet color. This has been standard practice since the gem was found in Tanzania in 1967, and it is how all tanzanite is valued. The color is permanent and stable and needs no special care.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eTanzanite is best suited to thoughtful wear. Clean with warm water, mild soap and a soft brush; avoid ultrasonic cleaning, sharp impacts and sudden temperature changes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51188425818359,"sku":"OTZ-2026-01666","price":895.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01666-tanzanite-replacement-1.jpg?v=1790472895"},{"product_id":"3-07-ct-antique-cut-aquamarine","title":"3.07 ct Antique-Cut Aquamarine","description":"\u003ch3\u003eCollector's Note\u003c\/h3\u003e\u003cp\u003eA soft, refreshing blue aquamarine with an unusual antique-style cushion mixed cut. At 3.07 ct, the stone has a generous face-up spread and the distinctive personality of an older cutting style, offering something quite different from the uniform precision of modern commercial aquamarine.\u003c\/p\u003e\u003ch3\u003eGemstone Details\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eGemstone:\u003c\/strong\u003e Natural Aquamarine\u003cbr\u003e\u003cstrong\u003eSpecies:\u003c\/strong\u003e Beryl\u003cbr\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 3.07 ct\u003cbr\u003e\u003cstrong\u003eShape \/ Cut:\u003c\/strong\u003e Cushion Mixed Cut\u003cbr\u003e\u003cstrong\u003eMeasurements:\u003c\/strong\u003e 9.01 × 8.08 × 6.24 mm\u003cbr\u003e\u003cstrong\u003eColor:\u003c\/strong\u003e Light Blue\u003cbr\u003e\u003cstrong\u003eTreatment:\u003c\/strong\u003e Heated (standard for aquamarine)\u003c\/p\u003e\u003ch3\u003eO50 Collector Evaluation\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eOtzera 50:\u003c\/strong\u003e 25\/50 — Discovery\u003cbr\u003e\u003cstrong\u003eFace-Up Performance:\u003c\/strong\u003e 65%\u003c\/p\u003e\u003ch3\u003eProvenance \/ Collector Significance\u003c\/h3\u003e\u003cp\u003eThe unusual cutting style gives this stone particular collector charm. Its appeal lies in the individuality of the antique-style proportions rather than the visual uniformity of a contemporary precision cut.\u003c\/p\u003e\u003ch3\u003eTreatment\u003c\/h3\u003e\u003cp\u003eMost aquamarine is gently heated to clear a faint green or yellow tint and leave a purer blue. The change is permanent and needs no special care.\u003c\/p\u003e\u003ch3\u003eCare \u0026amp; Setting\u003c\/h3\u003e\u003cp\u003eAquamarine is suitable for jewelry wear with sensible care. Clean with warm water, mild soap and a soft brush; avoid sharp impacts and harsh chemicals.\u003c\/p\u003e\u003ch3\u003eDigital Gem Passport\u003c\/h3\u003e\u003cp\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details, collector notes and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51188425851127,"sku":"OTZ-2026-01667","price":645.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01667-aquamarine-1.jpg?v=1789856833"},{"product_id":"11-26-ct-natural-nigerian-aquamarine","title":"11.26 ct Natural Nigerian Aquamarine","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eAn impressive 11.26 ct natural aquamarine from Nigeria with crisp oval modified brilliant cutting, strong brightness and an open, lively face-up presentation. Its attractive blue color, substantial size and well-balanced cut give the stone excellent presence while retaining a clean, elegant look.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Aquamarine\u003cbr\u003eSpecies: Beryl\u003cbr\u003eWeight: 11.26 ct\u003cbr\u003eShape \/ Cut: Oval Modified Brilliant\u003cbr\u003eMeasurements: 17.30 × 12.17 × 9.60 mm\u003cbr\u003eOrigin: Nigeria\u003cbr\u003eTreatment: Heated (standard for aquamarine)\u003cbr\u003eClarity: Loupe-visible needles and liquid inclusions\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003eOtzera 50: 40\/50 — Distinguished\u003cbr\u003eFace-Up Performance: 90%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTreatment\u003c\/strong\u003e\u003cbr\u003eMost aquamarine is gently heated to clear a faint green or yellow tint and leave a purer blue. The change is permanent and needs no special care.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eAquamarine is generally suitable for jewelry wear. Clean with warm water, mild soap and a soft brush; avoid harsh chemicals and sudden temperature changes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51211375247607,"sku":"OTZ-2026-01673","price":4950.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01673-nigerian-aquamarine-1_4981ac36-8c53-4c73-844e-acce4532343b.png?v=1790286144"},{"product_id":"9-65-ct-vivid-blue-violet-tanzanite-pgs-report","title":"9.65 ct Vivid Blue-Violet Tanzanite — PGS Report","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA nearly 10-carat tanzanite with the kind of color and presence that immediately commands attention. The stone shows a vivid blue face-up appearance with violet flashes from certain angles, excellent transparency and a completely eye-clean presentation. Its cushion mixed cut delivers strong light return and a broad, balanced face-up spread.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Tanzanite\u003cbr\u003eSpecies: Zoisite\u003cbr\u003eWeight: 9.65 ct\u003cbr\u003eShape \/ Cut: Cushion Mixed Cut \u003cbr\u003eMeasurements: 14.11 × 10.35 × 8.18 mm\u003cbr\u003eColor: Vivid Blue with Violet Flashes\u003cbr\u003eTransparency \/ Clarity: Transparent \/ Eye-Clean\u003cbr\u003eOrigin: Tanzania\u003cbr\u003eTreatment: Heated (standard for tanzanite)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003eOtzera 50 Score: \u003cstrong\u003e46 — Exceptional\u003c\/strong\u003e\u003cbr\u003eFace-Up Performance: 93%\u003cbr\u003eThis stone stands out for its saturated color, excellent transparency, strong optical performance and substantial near-10-carat size.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLaboratory Documentation\u003c\/strong\u003e\u003cbr\u003eAccompanied by Professional Gem Sciences Laboratory Report No. 43060109.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTreatment\u003c\/strong\u003e\u003cbr\u003eTanzanite is gently warmed after mining to bring out its blue-violet color. This has been standard practice since the gem was found in Tanzania in 1967, and it is how all tanzanite is valued. The color is permanent and stable and needs no special care.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eTanzanite should be protected from sharp impacts and sudden temperature changes. Clean with warm water, mild soap and a soft brush. Avoid ultrasonic and steam cleaning.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving the gemstone's identifying details, O50 evaluation and laboratory documentation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51218068144375,"sku":"OTZ-2026-01694","price":14475.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01694-tanzanite-1.jpg?v=1790484086"},{"product_id":"2-77-ct-unheated-australian-parti-sapphire-radiant-cut","title":"2.77 ct Unheated Australian Parti Sapphire — Radiant Cut","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA highly distinctive Australian parti-colored sapphire with deep rich blue, a concentrated yellow zone and flashes of green. The nearly square radiant cut is remarkably well made, giving the stone strong structure, crisp symmetry and lively optical performance while preserving its natural multi-color zoning.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Parti-Colored Sapphire\u003cbr\u003eSpecies: Corundum\u003cbr\u003eWeight: 2.77 ct\u003cbr\u003eShape \/ Cut: Radiant Cut\u003cbr\u003eMeasurements: 8.05 × 7.99 × 5.26 mm \u003cbr\u003eColor: Deep Blue, Yellow and Green Parti-Color\u003cbr\u003eOrigin: Australia\u003cbr\u003eTreatment: No Heat\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003eOtzera 50: \u003cstrong\u003e40 — Distinguished\u003c\/strong\u003e\u003cbr\u003eFace-Up Performance: 83%\u003cbr\u003eThe stone received particularly strong marks for cut and optical performance, reflecting its successful radiant-style faceting and balanced presentation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTreatment \u0026amp; Origin Disclosure\u003c\/strong\u003e\u003cbr\u003eThe current Otzera evaluation records Australian origin and no heat treatment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eSapphire is highly durable and suitable for jewelry wear. Clean with warm water, mild soap and a soft brush.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details, origin and treatment disclosures, and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51218158518519,"sku":"OTZ-2026-01697","price":4925.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01697-parti-sapphire-1.jpg?v=1790377050"},{"product_id":"1-68-ct-blue-sapphire-round-brilliant-cut","title":"1.68 ct Blue Sapphire — Round Brilliant Cut","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA lively 1.68 ct blue sapphire with a bright round brilliant presentation and strong face-up performance. The stone shows an attractive medium-to-deep blue appearance with hints of green visible from certain directions, while its round outline gives it a classic, highly wearable look.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Blue Sapphire\u003cbr\u003eSpecies: Corundum\u003cbr\u003eWeight: 1.68 ct\u003cbr\u003eShape \/ Cut: Round Brilliant Cut\u003cbr\u003eMeasurements: 7.03–7.00 × 4.60 mm\u003cbr\u003eColor: Blue with subtle green directional flashes\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003eOtzera 50: \u003cstrong\u003e35 — Distinguished\u003c\/strong\u003e\u003cbr\u003eFace-Up Performance: 90%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTreatment Disclosure\u003c\/strong\u003e\u003cbr\u003eHeat.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eSapphire is highly durable and suitable for jewelry wear. Clean with warm water, mild soap and a soft brush.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details, treatment disclosure and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51221585297655,"sku":"OTZ-2026-01701","price":1495.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01701-blue-sapphire-1.jpg?v=1790452526"},{"product_id":"1-83-ct-blue-green-sapphire-rectangular-step-cut","title":"1.83 ct Blue-Green Sapphire — Rectangular Step Cut","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA distinctive blue-green sapphire with a clean rectangular step-cut outline. The cut emphasizes broad flashes and linear reflections, giving the stone an architectural look and a more unusual presentation than a conventional brilliant-style sapphire.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Blue Sapphire\u003cbr\u003eSpecies: Corundum\u003cbr\u003eWeight: 1.83 ct\u003cbr\u003eShape \/ Cut: Rectangular Step Cut\u003cbr\u003eMeasurements: 8.06 × 5.73 × 2.95 mm\u003cbr\u003eColor: Blue-Green\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003eOtzera 50: \u003cstrong\u003e27 — Discovery\u003c\/strong\u003e\u003cbr\u003eFace-Up Performance: 53%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTreatment Disclosure\u003c\/strong\u003e\u003cbr\u003eHeat.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eSapphire is highly durable and suitable for jewelry wear. Clean with warm water, mild soap and a soft brush.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details, treatment disclosure and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51221585428727,"sku":"OTZ-2026-01702","price":650.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01702-blue-sapphire-1.jpg?v=1790452535"},{"product_id":"1-51-ct-blue-sapphire-oval-mixed-cut","title":"1.51 ct Bright Blue Sapphire — Oval Mixed Cut","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA classic oval blue sapphire with a pleasing medium-to-deep blue appearance and a balanced face-up spread. The oval mixed cut gives the stone a familiar, versatile shape while retaining enough internal contrast to create lively flashes across the face.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Blue Sapphire\u003cbr\u003eSpecies: Corundum\u003cbr\u003eWeight: 1.51 ct\u003cbr\u003eShape \/ Cut: Oval Mixed Cut\u003cbr\u003eMeasurements: 7.70 × 5.81 × 4.00 mm\u003cbr\u003eColor: Blue\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003eOtzera 50: \u003cstrong\u003e33 — Collectible\u003c\/strong\u003e\u003cbr\u003eFace-Up Performance: 75%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTreatment Disclosure\u003c\/strong\u003e\u003cbr\u003eHeat.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eSapphire is highly durable and suitable for jewelry wear. Clean with warm water, mild soap and a soft brush.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details, treatment disclosure and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51221585527031,"sku":"OTZ-2026-01703","price":995.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01703-blue-sapphire-1.jpg?v=1790452545"},{"product_id":"1-76-ct-deep-blue-sapphire-marquise-cut","title":"1.76 ct Deep Blue Sapphire — Marquise Cut","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA long, elegant marquise sapphire with a deep blue appearance and a dramatic elongated silhouette. The stone presents a darker face-up look, with flashes of brighter blue visible along the ends and facet junctions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Blue Sapphire\u003cbr\u003eSpecies: Corundum\u003cbr\u003eWeight: 1.76 ct\u003cbr\u003eShape \/ Cut: Marquise\u003cbr\u003eMeasurements: 11.60 × 5.02 × 3.83 mm\u003cbr\u003eColor: Deep Blue\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003eOtzera 50: \u003cstrong\u003e25 — Discovery\u003c\/strong\u003e\u003cbr\u003eFace-Up Performance: 45%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTreatment Disclosure\u003c\/strong\u003e\u003cbr\u003eHeat.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eSapphire is highly durable and suitable for jewelry wear. Clean with warm water, mild soap and a soft brush.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details, treatment disclosure and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51221585756407,"sku":"OTZ-2026-01705","price":650.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01705-blue-sapphire-1.jpg?v=1790452563"},{"product_id":"2-13-ct-parti-colored-sapphire-triangular-mixed-cut","title":"2.13 ct Parti-Colored Sapphire — Triangular Mixed Cut","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eAn unusual parti-colored sapphire with a broad triangular outline and cool blue-to-teal color variation across the face. The triangular mixed cut gives the stone a sculptural, contemporary character while emphasizing the natural tonal zoning visible from different angles.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Parti-Colored Sapphire\u003cbr\u003eSpecies: Corundum\u003cbr\u003eWeight: 2.13 ct\u003cbr\u003eShape \/ Cut: Triangular Mixed Cut\u003cbr\u003eMeasurements: 10.48 × 6.82 × 4.44 mm\u003cbr\u003eColor: Blue to Teal Parti-Color\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003eOtzera 50: \u003cstrong\u003e28 — Collectible\u003c\/strong\u003e\u003cbr\u003eFace-Up Performance: 70%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTreatment Disclosure\u003c\/strong\u003e\u003cbr\u003eHeat.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eSapphire is highly durable and suitable for jewelry wear. Clean with warm water, mild soap and a soft brush.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details, treatment disclosure and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51221585887479,"sku":"OTZ-2026-01706","price":1250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01706-parti-sapphire-1.jpg?v=1790452574"},{"product_id":"1-41-ct-blue-sapphire-pear-mixed-cut","title":"1.41 ct Blue Sapphire — Pear Mixed Cut","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA saturated blue sapphire with a graceful pear-shaped outline and a rich face-up color. The pear mixed cut gives the stone a classic silhouette while the concentrated blue body color creates strong visual presence for its 1.41 ct weight.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Blue Sapphire\u003cbr\u003eSpecies: Corundum\u003cbr\u003eWeight: 1.41 ct\u003cbr\u003eShape \/ Cut: Pear Mixed Cut\u003cbr\u003eMeasurements: 8.51 × 6.07 × 3.54 mm\u003cbr\u003eColor: Rich Blue\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003eOtzera 50: \u003cstrong\u003e34 — Collectible\u003c\/strong\u003e\u003cbr\u003eFace-Up Performance: 73%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTreatment Disclosure\u003c\/strong\u003e\u003cbr\u003eHeat.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eSapphire is highly durable and suitable for jewelry wear. Clean with warm water, mild soap and a soft brush.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details, treatment disclosure and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51221586018551,"sku":"OTZ-2026-01707","price":944.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01707-blue-sapphire-1.jpg?v=1790452583"},{"product_id":"1-02-ct-blue-sapphire-oval-mixed-cut","title":"1.02 ct Blue Sapphire — Oval Mixed Cut","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA bright one-carat blue sapphire with a classic oval outline and lively face-up appearance. The stone combines attractive blue color with balanced proportions and an 83% face-up performance index, giving it a clean, versatile presentation for jewelry.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Blue Sapphire\u003cbr\u003eSpecies: Corundum\u003cbr\u003eWeight: 1.02 ct\u003cbr\u003eShape \/ Cut: Oval Mixed Cut\u003cbr\u003eMeasurements: 7.08 × 5.03 × 3.49 mm\u003cbr\u003eColor: Blue\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003eOtzera 50: \u003cstrong\u003e33 — Collectible\u003c\/strong\u003e\u003cbr\u003eFace-Up Performance: 83%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTreatment Disclosure\u003c\/strong\u003e\u003cbr\u003eHeat.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eSapphire is highly durable and suitable for jewelry wear. Clean with warm water, mild soap and a soft brush.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details, treatment disclosure and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51221803892983,"sku":"OTZ-2026-01713","price":895.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01713-blue-sapphire-1.jpg?v=1790472088"},{"product_id":"1-37-ct-deep-blue-sapphire-emerald-cut","title":"1.37 ct Deep Blue Sapphire — Emerald Cut","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA deep blue sapphire with a crisp emerald-cut outline and a bold, architectural look. The step-cut geometry gives the stone a distinct personality, with broad flashes framed by its dark blue body color.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Blue Sapphire\u003cbr\u003eSpecies: Corundum\u003cbr\u003eWeight: 1.37 ct\u003cbr\u003eShape \/ Cut: Emerald Cut \u003cbr\u003eMeasurements: 7.00 × 5.06 × 3.62 mm\u003cbr\u003eColor: Deep Blue\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003eOtzera 50: \u003cstrong\u003e26 — Discovery\u003c\/strong\u003e\u003cbr\u003eFace-Up Performance: 65%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTreatment Disclosure\u003c\/strong\u003e\u003cbr\u003eHeat.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eSapphire is highly durable and suitable for jewelry wear. Clean with warm water, mild soap and a soft brush.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details, treatment disclosure and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51221803925751,"sku":"OTZ-2026-01714","price":695.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01714-blue-sapphire-1.jpg?v=1790472042"},{"product_id":"1-20-ct-blue-sapphire-oval-mixed-cut","title":"1.20 ct Blue Sapphire — Oval Mixed Cut","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA medium-blue sapphire in a slender oval mixed cut. Its softer color and elongated proportions give the stone an understated look, making it a versatile option for a classic ring or pendant design. \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Blue Sapphire\u003cbr\u003eSpecies: Corundum\u003cbr\u003eWeight: 1.20 ct\u003cbr\u003eShape \/ Cut: Oval Mixed Cut\u003cbr\u003eMeasurements: 7.86 × 4.82 × 3.06 mm\u003cbr\u003eColor: Medium Blue\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003eOtzera 50: \u003cstrong\u003e22 — Discovery\u003c\/strong\u003e\u003cbr\u003eFace-Up Performance: 48%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTreatment Disclosure\u003c\/strong\u003e\u003cbr\u003eHeat.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eSapphire is highly durable and suitable for jewelry wear. Clean with warm water, mild soap and a soft brush.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details, treatment disclosure and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51221803958519,"sku":"OTZ-2026-01715","price":495.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01715-blue-sapphire-1.jpg?v=1790463259"},{"product_id":"1-09-ct-deep-blue-sapphire-pear-mixed-cut","title":"1.09 ct Deep Blue Sapphire — Pear Mixed Cut","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA deep blue sapphire with a pear-shaped outline and concentrated body color. The pear mixed cut gives the stone a classic silhouette, while its darker tone creates a more dramatic overall appearance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Blue Sapphire\u003cbr\u003eSpecies: Corundum\u003cbr\u003eWeight: 1.09 ct\u003cbr\u003eShape \/ Cut: Pear Mixed Cut\u003cbr\u003eMeasurements: 7.36 × 6.03 × 3.05 mm\u003cbr\u003eColor: Deep Blue\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003eOtzera 50: \u003cstrong\u003e23 — Discovery\u003c\/strong\u003e\u003cbr\u003eFace-Up Performance: 48%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTreatment Disclosure\u003c\/strong\u003e\u003cbr\u003eHeat.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eSapphire is highly durable and suitable for jewelry wear. Clean with warm water, mild soap and a soft brush.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details, treatment disclosure and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51221803991287,"sku":"OTZ-2026-01716","price":550.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01716-blue-sapphire-1-enhanced.jpg?v=1790471797"},{"product_id":"2-73-ct-unheated-blue-sapphire-gia-report","title":"2.73 ct Unheated Blue Sapphire — GIA Report","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003cbr\u003eA 2.73 ct natural blue sapphire with an appealing antique cushion character and the added collector value of documented unheated status. The stone has a softly elongated cushion outline and a classic mixed cutting style that gives it an individual, vintage personality.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003cbr\u003eGemstone: Natural Blue Sapphire\u003cbr\u003eSpecies: Corundum\u003cbr\u003eWeight: 2.73 ct\u003cbr\u003eShape \/ Cut: Cushion Mixed Cut\u003cbr\u003eMeasurements: 8.94 × 6.90 × 5.15 mm\u003cbr\u003eColor: Blue\u003cbr\u003eTransparency: Transparent\u003cbr\u003eTreatment: No Indications of Heating\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003cbr\u003eOtzera 50: \u003cstrong\u003e35 — Distinguished\u003c\/strong\u003e\u003cbr\u003eFace-Up Performance: 78%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLaboratory Documentation\u003c\/strong\u003e\u003cbr\u003eAccompanied by GIA Sapphire Report No. 6194856137, dated November 27, 2018.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003cbr\u003eSapphire is highly durable and suitable for jewelry wear. Clean with warm water, mild soap and a soft brush.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003cbr\u003eAccompanied by an Otzera Digital Gem Passport preserving the gemstone's identifying details, O50 evaluation and GIA documentation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51222638002423,"sku":"OTZ-2026-01719","price":4950.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01719-blue-sapphire-3.jpg?v=1790480762"},{"product_id":"39-06-ct-aquamarine-emerald-cut","title":"39.06 ct Aquamarine — Emerald Cut","description":"\u003cp\u003e\u003cstrong\u003eCollector’s Note\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAn unusually substantial 39.06-carat aquamarine with a crisp emerald cut and cool, open blue appearance. Its exceptional scale gives this stone immediate presence while the step-cut geometry emphasizes its transparency and clean architectural form.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eGemstone: Aquamarine\u003cbr\u003eSpecies: Beryl\u003cbr\u003eWeight: 39.06 ct\u003cbr\u003eCut: Emerald Cut\u003cbr\u003eDimensions: 20.46 × 18.90 × 12.45 mm\u003cbr\u003eTreatment: Heated (standard for aquamarine)\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eO50 Score: 37\/50 — Distinguished\u003cbr\u003eFace-Up Performance: 70%\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTreatment\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eMost aquamarine is gently heated to clear a faint green or yellow tint and leave a purer blue. The change is permanent and needs no special care.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eOtzera ID: OTZ-2026-01733\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51229570334967,"sku":"OTZ-2026-01733","price":6845.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01733-1_24939c3f-35b8-42b1-bb43-c447ed886017.jpg?v=1790650780"},{"product_id":"10-14-ct-indicolite-tourmaline","title":"10.14 ct Indicolite Tourmaline","description":"\u003cp\u003e\u003cstrong\u003eCollector’s Note\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA substantial 10.14-carat indicolite tourmaline with a deep blue-green appearance. Its large size and moody teal coloration give it a distinctive presence for collectors drawn to darker, strongly individual tourmalines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eGemstone: Indicolite Tourmaline\u003cbr\u003eSpecies: Tourmaline\u003cbr\u003eWeight: 10.14 ct\u003cbr\u003eDimensions: 13.49 × 11.88 × 7.77 mm\u003cbr\u003eTreatment: None\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eO50 Score: 28\/50 — Collectible\u003cbr\u003eFace-Up Performance: 48%\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTreatment\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTourmaline comes in more colors than almost any other gem, and this stone’s color is natural.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eOtzera ID: OTZ-2026-01737\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51229570531575,"sku":"OTZ-2026-01737","price":1950.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01737-1.jpg?v=1790650344"},{"product_id":"4-05-ct-cambodian-blue-zircon-oval-mixed-cut","title":"4.05 ct Cambodian Blue Zircon — Oval Mixed Cut","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA vivid 4.05-carat Cambodian blue zircon with crisp brilliance, lively dispersion and a well-proportioned oval silhouette. Its saturated electric-blue appearance and strong face-up brightness give the stone immediate visual impact.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eGemstone: Blue Zircon\u003cbr\u003eWeight: 4.05 ct\u003cbr\u003eCut: Oval Mixed Cut\u003cbr\u003eMeasurements: 9.05 × 7.32 × 6.00 mm\u003cbr\u003eOrigin: Cambodia\u003cbr\u003eTreatment: Heated (standard for blue zircon)\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e35\/50 — Distinguished\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTreatment\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eBlue zircon gets its color from gentle heating of brownish zircon crystals, a practice in Cambodia for generations. Nearly every blue zircon sold has been heated, and the color is stable in everyday wear. One tip: keep it away from tanning beds and UV nail lamps. Strong ultraviolet can give it a temporary brownish cast, which a short time under an ordinary incandescent bulb restores.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eOTZ-2026-01738\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51229655433463,"sku":"OTZ-2026-01738","price":1295.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01738-1.jpg?v=1790633140"},{"product_id":"4-22-ct-cambodian-blue-zircon-oval-mixed-cut","title":"4.22 ct Cambodian Blue Zircon — Oval Mixed Cut","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA 4.22-carat Cambodian blue zircon with a classic elongated oval profile and bright blue color. The stone offers attractive brilliance and flashes of zircon's characteristic fire, with a slightly softer overall face-up performance than the higher-rated examples in this group.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eGemstone: Blue Zircon\u003cbr\u003eWeight: 4.22 ct\u003cbr\u003eCut: Oval Mixed Cut\u003cbr\u003eMeasurements: 10.30 × 7.51 × 5.59 mm\u003cbr\u003eOrigin: Cambodia\u003cbr\u003eTreatment: Heated (standard for blue zircon)\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e32\/50 — Collectible\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTreatment\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eBlue zircon gets its color from gentle heating of brownish zircon crystals, a practice in Cambodia for generations. Nearly every blue zircon sold has been heated, and the color is stable in everyday wear. One tip: keep it away from tanning beds and UV nail lamps. Strong ultraviolet can give it a temporary brownish cast, which a short time under an ordinary incandescent bulb restores.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eOTZ-2026-01739\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51229655466231,"sku":"OTZ-2026-01739","price":1195.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01739-2.jpg?v=1790633156"},{"product_id":"5-08-ct-cambodian-blue-zircon-oval-mixed-cut","title":"5.08 ct Cambodian Blue Zircon — Oval Mixed Cut","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA substantial 5.08-carat Cambodian blue zircon combining vivid blue color with strong brilliance and a broad, balanced oval face-up appearance. The larger size and energetic light return make this an especially appealing collector stone.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eGemstone: Blue Zircon\u003cbr\u003eWeight: 5.08 ct\u003cbr\u003eCut: Oval Mixed Cut\u003cbr\u003eMeasurements: 9.98 × 8.13 × 6.41 mm\u003cbr\u003eOrigin: Cambodia\u003cbr\u003eTreatment: Heated (standard for blue zircon)\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e35\/50 — Distinguished\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTreatment\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eBlue zircon gets its color from gentle heating of brownish zircon crystals, a practice in Cambodia for generations. Nearly every blue zircon sold has been heated, and the color is stable in everyday wear. One tip: keep it away from tanning beds and UV nail lamps. Strong ultraviolet can give it a temporary brownish cast, which a short time under an ordinary incandescent bulb restores.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eOTZ-2026-01740\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51229655531767,"sku":"OTZ-2026-01740","price":1595.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01740-1.jpg?v=1790650707"},{"product_id":"6-04-ct-cambodian-blue-zircon-oval-mixed-cut","title":"6.04 ct Cambodian Blue Zircon — Oval Mixed Cut","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA striking 6.04-carat Cambodian blue zircon with vivid blue color, excellent brightness and the pronounced fire for which fine zircon is prized. Its substantial size, strong optical performance and balanced oval shape make it the standout of this group.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eGemstone: Blue Zircon\u003cbr\u003eWeight: 6.04 ct\u003cbr\u003eCut: Oval Mixed Cut\u003cbr\u003eMeasurements: 10.39 × 8.12 × 7.32 mm\u003cbr\u003eOrigin: Cambodia\u003cbr\u003eTreatment: Heated (standard for blue zircon)\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e37\/50 — Distinguished\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTreatment\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eBlue zircon gets its color from gentle heating of brownish zircon crystals, a practice in Cambodia for generations. Nearly every blue zircon sold has been heated, and the color is stable in everyday wear. One tip: keep it away from tanning beds and UV nail lamps. Strong ultraviolet can give it a temporary brownish cast, which a short time under an ordinary incandescent bulb restores.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eOTZ-2026-01741\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51229655564535,"sku":"OTZ-2026-01741","price":2095.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01741-1.jpg?v=1790633173"},{"product_id":"2-53-ct-aquamarine-oval-mixed-cut","title":"2.53 ct Aquamarine — Oval Mixed Cut","description":"\u003ch3\u003eCollector's Note\u003c\/h3\u003e\u003cp\u003eA light, icy-blue aquamarine with a pleasing 2.53 ct presence and classic oval mixed cut. The stone shows attractive brightness and a clean, open presentation, with loupe-visible inclusions noted in the Otzera evaluation.\u003c\/p\u003e\u003ch3\u003eGemstone Details\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eGemstone:\u003c\/strong\u003e Natural Aquamarine\u003cbr\u003e\u003cstrong\u003eSpecies:\u003c\/strong\u003e Beryl\u003cbr\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 2.53 ct\u003cbr\u003e\u003cstrong\u003eShape \/ Cut:\u003c\/strong\u003e Oval Mixed Cut\u003cbr\u003e\u003cstrong\u003eMeasurements:\u003c\/strong\u003e 9.91 × 7.87 × 5.43 mm\u003cbr\u003e\u003cstrong\u003eTreatment:\u003c\/strong\u003e Heated (standard for aquamarine)\u003c\/p\u003e\u003ch3\u003eO50 Collector Evaluation\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eOtzera 50:\u003c\/strong\u003e 29 — Collectible\u003cbr\u003e\u003cstrong\u003eFace-Up Performance:\u003c\/strong\u003e 73%\u003c\/p\u003e\u003ch3\u003eTreatment\u003c\/h3\u003e\u003cp\u003eMost aquamarine is gently heated to clear a faint green or yellow tint and leave a purer blue. The change is permanent and needs no special care.\u003c\/p\u003e\u003ch3\u003eCare \u0026amp; Setting\u003c\/h3\u003e\u003cp\u003eAquamarine is suitable for jewelry with sensible protection from hard knocks. Clean with warm water, mild soap and a soft brush.\u003c\/p\u003e\u003ch3\u003eDigital Gem Passport\u003c\/h3\u003e\u003cp\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51231738495223,"sku":"OTZ-2026-01725","price":695.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01725-aquamarine-1.jpg?v=1790696193"},{"product_id":"1-03-ct-unheated-sri-lankan-blue-sapphire-oval-mixed-cut","title":"1.03 ct Unheated Sri Lankan Blue Sapphire — Oval Mixed Cut","description":"\u003ch3\u003eCollector's Note\u003c\/h3\u003e\u003cp\u003eA light violet-blue natural sapphire from Sri Lanka with an elegant elongated oval outline. Its unheated status adds collector interest, while the softly saturated color gives the stone a refined, understated appearance.\u003c\/p\u003e\u003ch3\u003eGemstone Details\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eGemstone:\u003c\/strong\u003e Natural Blue Sapphire\u003cbr\u003e\u003cstrong\u003eSpecies:\u003c\/strong\u003e Corundum\u003cbr\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.03 ct\u003cbr\u003e\u003cstrong\u003eShape \/ Cut:\u003c\/strong\u003e Oval Mixed Cut\u003cbr\u003e\u003cstrong\u003eMeasurements:\u003c\/strong\u003e 7.01 × 4.93 × 3.03 mm\u003cbr\u003e\u003cstrong\u003eOrigin:\u003c\/strong\u003e Sri Lanka (Ceylon)\u003c\/p\u003e\u003ch3\u003eO50 Collector Evaluation\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eOtzera 50:\u003c\/strong\u003e 29 — Collectible\u003cbr\u003e\u003cstrong\u003eFace-Up Performance:\u003c\/strong\u003e 58%\u003c\/p\u003e\u003ch3\u003eTreatment \u0026amp; Origin\u003c\/h3\u003e\u003cp\u003eNo heat. Sri Lanka (Ceylon).\u003c\/p\u003e\u003ch3\u003eCare \u0026amp; Setting\u003c\/h3\u003e\u003cp\u003eSapphire is highly durable and suitable for jewelry wear. Clean with warm water, mild soap and a soft brush.\u003c\/p\u003e\u003ch3\u003eDigital Gem Passport\u003c\/h3\u003e\u003cp\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details, treatment and origin information, and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51231739609335,"sku":"OTZ-2026-01729","price":895.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01729-blue-sapphire-1.jpg?v=1790701796"},{"product_id":"8-19-ctw-bicolor-tanzanite-sugarloaf-cabochon-pair","title":"8.19 ctw Bicolor Tanzanite Sugarloaf Cabochon Pair","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA highly individual matched pair of bicolor tanzanites totaling 8.19 carats, displaying shifting blue, green and violet tones from different viewing angles. The softly domed sugarloaf forms are unusually sculptural, while prominent internal feathers have been deliberately oriented by the cutter as part of the visual composition.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eGemstone: Tanzanite\u003cbr\u003eSpecies: Zoisite\u003cbr\u003eTotal Weight: 8.19 ctw\u003cbr\u003eConfiguration: Matched Pair\u003cbr\u003eShape \/ Cut: Sugarloaf Cabochon\u003cbr\u003eMeasurements: 8.35–8.31 × 5.70 mm\u003cbr\u003eOrigin: Tanzania\u003cbr\u003eTreatment: Heated (standard for tanzanite)\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eOtzera 50: 30\/50 — Collectible\u003cbr\u003eFace-Up Performance: 80%\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTreatment\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTanzanite is gently warmed after mining to bring out its blue-violet color. This has been standard practice since the gem was found in Tanzania in 1967, and it is how all tanzanite is valued. The color is permanent and stable and needs no special care.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTanzanite requires thoughtful wear and setting protection. Clean with warm water, mild soap and a soft brush; avoid ultrasonic or steam cleaning and protect the stones from impact.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAccompanied by an Otzera Digital Gem Passport preserving the pair's identifying details, origin and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51231836635383,"sku":"OTZ-2026-01731","price":1495.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01731-1.jpg?v=1790698885"},{"product_id":"8-20-ct-cambodian-blue-zircon-oval-mixed-cut","title":"8.20 ct Cambodian Blue Zircon — Oval Mixed Cut","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA substantial 8.20 ct Cambodian blue zircon with bright cyan-blue color, strong brilliance and the lively optical character for which fine zircon is prized. Its generous size and balanced oval presentation give it notable collector presence.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eGemstone: Blue Zircon\u003cbr\u003eSpecies: Zircon\u003cbr\u003eWeight: 8.20 ct\u003cbr\u003eShape \/ Cut: Oval Mixed Cut\u003cbr\u003eMeasurements: 13.57 × 9.25 × 6.75 mm\u003cbr\u003eOrigin: Cambodia\u003cbr\u003eTreatment: Heated (standard for blue zircon)\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eOtzera 50: 40\/50 — Distinguished\u003cbr\u003eFace-Up Performance: 88%\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTreatment\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eBlue zircon gets its color from gentle heating of brownish zircon crystals, a practice in Cambodia for generations. Nearly every blue zircon sold has been heated, and the color is stable in everyday wear. One tip: keep it away from tanning beds and UV nail lamps. Strong ultraviolet can give it a temporary brownish cast, which a short time under an ordinary incandescent bulb restores.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eZircon can be brittle despite its excellent brilliance. Clean with warm water, mild soap and a soft brush; avoid ultrasonic or steam cleaning and protect the stone from sharp impacts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details, origin and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51233274495223,"sku":"OTZ-2026-01742","price":2870.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01742-1.jpg?v=1790712059"},{"product_id":"1-31-ct-blue-sapphire-oval-mixed-cut","title":"1.31 ct Blue Sapphire — Oval Mixed Cut","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA softly colored 1.31 ct natural blue sapphire in an elongated oval mixed cut. The stone has a bright, open appearance with noticeable windowing; that optical trade-off is reflected in its Discovery-level O50 evaluation rather than obscured in the presentation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eGemstone: Natural Blue Sapphire\u003cbr\u003eSpecies: Natural Corundum\u003cbr\u003eWeight: 1.31 ct\u003cbr\u003eShape \/ Cut: Oval Mixed Cut\u003cbr\u003eMeasurements: 7.90 × 5.89 × 3.08 mm\u003cbr\u003eColor: Blue\u003cbr\u003eTransparency: Transparent\u003cbr\u003eTreatment: Heated\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eOtzera 50: 25\/50 — Discovery\u003cbr\u003eFace-Up Performance: 53%\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTreatment\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eHeat treatment is recorded for this sapphire.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSapphire is highly durable and suitable for everyday jewelry with normal care. Clean with warm water, mild soap and a soft brush.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details, treatment disclosure and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51236593598711,"sku":"OTZ-2026-01759","price":495.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01759-1.jpg?v=1790796841"},{"product_id":"4-04-ct-tanzanian-color-change-sapphire-gia-origin-report","title":"4.04 ct Tanzanian Color-Change Sapphire — GIA Origin Report","description":"\u003cp\u003e\u003cstrong\u003eCollector's Note\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA substantial 4.04 ct natural sapphire from Tanzania with a GIA-documented color change from green-blue to purple under different lighting. The oval mixed cut gives the stone a broad face-up presentation; its deeper tone is balanced by the strength of the color-change phenomenon and the added collector value of documented unheated status.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eGemstone Details\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eGemstone: Natural Color-Change Sapphire\u003cbr\u003eSpecies: Natural Corundum\u003cbr\u003eWeight: 4.04 ct\u003cbr\u003eShape \/ Cut: Oval Mixed Cut\u003cbr\u003eMeasurements: 10.46 × 7.33 × 5.69 mm\u003cbr\u003eOrigin: Tanzania\u003cbr\u003eColor: Green-blue changing to purple\u003cbr\u003eTransparency: Transparent\u003cbr\u003eTreatment: No indications of heating\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eO50 Collector Evaluation\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eOtzera 50: 36\/50 — Distinguished\u003cbr\u003eFace-Up Performance: 65%\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTreatment \u0026amp; Origin\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eGIA Sapphire Origin Report No. 2245074853 identifies natural sapphire of Tanzanian geographic origin with no indications of heating and documents the stone's color-change behavior.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eLaboratory Documentation\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAccompanied by GIA Sapphire Origin Report No. 2245074853, dated September 25, 2026.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCare \u0026amp; Setting\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSapphire is highly durable and suitable for jewelry wear with normal care. Clean with warm water, mild soap and a soft brush.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDigital Gem Passport\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAccompanied by an Otzera Digital Gem Passport preserving its identifying details, laboratory documentation, origin and treatment disclosures, color-change phenomenon and O50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51236633084151,"sku":"OTZ-2026-01754","price":6495.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/upload-1792916687092.jpg?v=1792916688"},{"product_id":"1-51-ct-blue-sapphire-oval-mixed-cut-1","title":"1.51 ct Deep Blue Sapphire — Oval Mixed Cut","description":"\u003ch2\u003eCollector’s Note\u003c\/h2\u003e\u003cp\u003eDeep blue color and a graceful oval shape give this 1.51 ct natural sapphire a classic appeal. Its mixed cut reveals blue flashes as the viewing angle changes, and the elongated outline offers an elegant presence at 7.9 mm long. A versatile stone for a personal collection or a bespoke ring or pendant.\u003c\/p\u003e\u003ch2\u003eGemstone Details\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eGemstone: Natural blue sapphire\u003c\/li\u003e\n\u003cli\u003eSpecies: Corundum\u003c\/li\u003e\n\u003cli\u003eWeight: 1.51 ct\u003c\/li\u003e\n\u003cli\u003eShape \/ Cut: Oval Mixed Cut\u003c\/li\u003e\n\u003cli\u003eMeasurements: 7.9 x 6.0 x 3.5 mm\u003c\/li\u003e\n\u003cli\u003eTreatment: Heated\u003c\/li\u003e\n\u003cli\u003eOtzera ID: OTZ-2026-01764\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eOtzera 50\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003e29\/50 — Collectible\u003c\/strong\u003e\u003cbr\u003eFace-Up Performance Index: 70%\u003c\/p\u003e\u003ch2\u003eCare\u003c\/h2\u003e\u003cp\u003eClean with lukewarm water, mild soap and a soft brush. Protect from hard knocks and sudden temperature changes.\u003c\/p\u003e\u003cp\u003ePhotographs show this individual gemstone. Color may vary with lighting and screen settings.\u003c\/p\u003e\u003ch2\u003eDigital Gem Passport\u003c\/h2\u003e\u003cp\u003e\u003ca href=\"https:\/\/otzera.com\/pages\/passport\/otz-2026-01764\"\u003eView this gemstone’s Digital Gem Passport\u003c\/a\u003e for its permanent record and Otzera 50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51504031858935,"sku":"OTZ-2026-01764","price":695.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01764-1-4k.jpg?v=1793202595"},{"product_id":"1-29-ct-blue-sapphire-round-mixed-cut","title":"1.29 ct Blue Sapphire — Round Mixed Cut","description":"\u003ch2\u003eCollector’s Note\u003c\/h2\u003e\u003cp\u003eInky blue color gives this 1.29 ct natural Tanzanian sapphire a distinctive, understated elegance. The round mixed cut reveals flashes of blue as the stone moves, while its pleasingly clear appearance lets you explore the facets within. At approximately 6.2 mm across, it is an attractive choice for a classic setting or a collection of blue gemstones.\u003c\/p\u003e\u003ch2\u003eGemstone Details\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eGemstone: Natural blue sapphire\u003c\/li\u003e\n\u003cli\u003eSpecies: Corundum\u003c\/li\u003e\n\u003cli\u003eWeight: 1.29 ct\u003c\/li\u003e\n\u003cli\u003eShape \/ Cut: Round Mixed Cut\u003c\/li\u003e\n\u003cli\u003eMeasurements: 6.1-6.2 x 4.2 mm\u003c\/li\u003e\n\u003cli\u003eOrigin: Tanzania\u003c\/li\u003e\n\u003cli\u003eTreatment: Heated\u003c\/li\u003e\n\u003cli\u003eOtzera ID: OTZ-2026-01770\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eOtzera 50\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003e27\/50 — Discovery\u003c\/strong\u003e\u003cbr\u003eFace-Up Performance Index: 55%\u003c\/p\u003e\u003ch2\u003eCare\u003c\/h2\u003e\u003cp\u003eClean with lukewarm water, mild soap and a soft brush. Protect from hard knocks and sudden temperature changes.\u003c\/p\u003e\u003cp\u003ePhotographs show this individual gemstone. Color may vary with lighting and screen settings.\u003c\/p\u003e\u003ch2\u003eDigital Gem Passport\u003c\/h2\u003e\u003cp\u003e\u003ca href=\"https:\/\/otzera.com\/pages\/passport\/otz-2026-01770\"\u003eView this gemstone’s Digital Gem Passport\u003c\/a\u003e for its permanent record and Otzera 50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51504040280311,"sku":"OTZ-2026-01770","price":565.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01770-1-4k.jpg?v=1793202595"},{"product_id":"3-53-ct-blue-spinel-oval-mixed-cut","title":"3.53 ct Blue Spinel — Oval Mixed Cut","description":"\u003ch2\u003eCollector’s Note\u003c\/h2\u003e\u003cp\u003eCool steel-blue color and an elongated oval shape give this natural spinel a distinctive elegance. Broad facets catch silvery reflections and flashes of blue as the viewing angle changes. At 3.53 ct and 12.5 mm long, it has a generous presence that would suit a statement pendant, a bespoke ring or a collection exploring the many shades of blue.\u003c\/p\u003e\u003ch2\u003eGemstone Details\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eGemstone: Natural blue spinel\u003c\/li\u003e\n\u003cli\u003eSpecies: Spinel\u003c\/li\u003e\n\u003cli\u003eWeight: 3.53 ct\u003c\/li\u003e\n\u003cli\u003eShape \/ Cut: Oval Mixed Cut\u003c\/li\u003e\n\u003cli\u003eMeasurements: 12.5 x 7.7 x 4.4 mm\u003c\/li\u003e\n\u003cli\u003eTreatment: None\u003c\/li\u003e\n\u003cli\u003eOtzera ID: OTZ-2026-01765\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eOtzera 50\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003e28\/50 — Collectible\u003c\/strong\u003e\u003cbr\u003eFace-Up Performance Index: 55%\u003c\/p\u003e\u003ch2\u003eTreatment\u003c\/h2\u003e\u003cp\u003eSpinel is rarely treated, and much of its appeal to collectors is that its color is natural.\u003c\/p\u003e\u003ch2\u003eCare\u003c\/h2\u003e\u003cp\u003eClean gently with lukewarm water, mild soap and a soft brush. Protect from hard knocks and sudden temperature changes.\u003c\/p\u003e\u003cp\u003ePhotographs show this individual gemstone. Color may vary with lighting and screen settings.\u003c\/p\u003e\u003ch2\u003eDigital Gem Passport\u003c\/h2\u003e\u003cp\u003e\u003ca href=\"https:\/\/otzera.com\/pages\/passport\/otz-2026-01765\"\u003eView this gemstone’s Digital Gem Passport\u003c\/a\u003e for its permanent record and Otzera 50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51505266032887,"sku":"OTZ-2026-01765","price":1395.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01765-1-4k.jpg?v=1793202595"},{"product_id":"2-51-ct-aquamarine-emerald-cut","title":"2.51 ct Aquamarine — Emerald Cut","description":"\u003ch2\u003eCollector’s Note\u003c\/h2\u003e\u003cp\u003eCool blue color and long, parallel facets give this natural Pakistani aquamarine a clean, architectural beauty. The emerald cut creates broad reflections of light, with clipped corners completing its elegant outline. At 2.51 ct and 10.3 mm long, it has the presence to anchor a refined pendant or ring and the appeal to stand on its own in a gemstone collection.\u003c\/p\u003e\u003ch2\u003eGemstone Details\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eGemstone: Natural aquamarine\u003c\/li\u003e\n\u003cli\u003eSpecies: Beryl\u003c\/li\u003e\n\u003cli\u003eWeight: 2.51 ct\u003c\/li\u003e\n\u003cli\u003eShape \/ Cut: Emerald Cut\u003c\/li\u003e\n\u003cli\u003eMeasurements: 10.3 x 6.7 x 5.0 mm\u003c\/li\u003e\n\u003cli\u003eOrigin: Pakistan\u003c\/li\u003e\n\u003cli\u003eTreatment: Heated (standard for aquamarine)\u003c\/li\u003e\n\u003cli\u003eOtzera ID: OTZ-2026-01768\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eOtzera 50\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003e35\/50 — Distinguished\u003c\/strong\u003e\u003cbr\u003eFace-Up Performance Index: 83%\u003c\/p\u003e\u003ch2\u003eTreatment\u003c\/h2\u003e\u003cp\u003eMost aquamarine is gently heated to clear a faint green or yellow tint and leave a purer blue. The change is permanent and needs no special care.\u003c\/p\u003e\u003ch2\u003eCare\u003c\/h2\u003e\u003cp\u003eClean gently with lukewarm water, mild soap and a soft brush. Protect from hard knocks and sudden temperature changes.\u003c\/p\u003e\u003cp\u003ePhotographs show this individual gemstone. Color may vary with lighting and screen settings.\u003c\/p\u003e\u003ch2\u003eDigital Gem Passport\u003c\/h2\u003e\u003cp\u003e\u003ca href=\"https:\/\/otzera.com\/pages\/passport\/otz-2026-01768\"\u003eView this gemstone’s Digital Gem Passport\u003c\/a\u003e for its permanent record and Otzera 50 evaluation.\u003c\/p\u003e","brand":"Otzera","offers":[{"title":"Default Title","offer_id":51505274257655,"sku":"OTZ-2026-01768","price":795.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/files\/OTZ-2026-01768-1-4k.jpg?v=1793202596"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/9999\/6919\/collections\/1.27sapphirecambodia_b4b58a19-4569-4b7d-b645-379df5034cb6.png?v=1792924252","url":"https:\/\/otzera.com\/collections\/blue-gemstones.oembed?page=2","provider":"Otzera","version":"1.0","type":"link"}