{"title":"Tanzanite","description":"\u003cp\u003eOur current selection of tanzanite, found in a single small area of Tanzania’s Merelani Hills. Its blue-violet color shifts with the light — a quality we look for in every stone we select.\u003c\/p\u003e\u003cp\u003eEach stone is selected individually and disclosed in full, and rated stones carry an \u003ca href=\"\/pages\/otzera-50\"\u003eOtzera 50\u003c\/a\u003e score judged against their own species.\u003c\/p\u003e","products":[{"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":"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":"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":"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"}],"url":"https:\/\/otzera.com\/collections\/tanzanite.oembed","provider":"Otzera","version":"1.0","type":"link"}