{"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\/products\/8-19-ctw-bicolor-tanzanite-sugarloaf-cabochon-pair","provider":"Otzera","version":"1.0","type":"link"}