{"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","url":"https:\/\/otzera.com\/products\/4-04-ct-tanzanian-color-change-sapphire-gia-origin-report","provider":"Otzera","version":"1.0","type":"link"}