{"product_id":"2-81-carats-natural-cobalt-spinel-sri-lanka-gfco-certified","title":"2.81 Carats | Natural Cobalt Spinel - Sri Lanka (GFCO Certified)","description":"\u003cp\u003e\u003cspan\u003eAn impressive \u003c\/span\u003e\u003cspan\u003e2.81-carat natural blue cobalt spinel from Sri Lanka\u003c\/span\u003e\u003cspan\u003e, accompanied by a GFCO Gem Lab identification report confirming the gemstone as \u003c\/span\u003e\u003cspan\u003eBLUE COBALT SPINEL\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe stone presents a deep, saturated blue body color with flashes of brighter cobalt, royal blue and electric cyan as light moves across its facets. Its substantial \u003c\/span\u003e\u003cspan\u003e2.81-carat weight\u003c\/span\u003e\u003cspan\u003e gives the gemstone considerable presence, while the oval double-brilliant crown and step-cut pavilion create contrasting areas of deep blue and concentrated flashes of brighter color.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCobalt blue spinel occupies a distinctive niche within the spinel family. Cobalt is associated with the highly prized blue coloration found in certain natural spinels, and laboratory documentation separating cobalt spinel from ordinary blue spinel is particularly important for collector material.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe accompanying \u003c\/span\u003e\u003cspan\u003eGFCO Gem Lab report AAP95839\u003c\/span\u003e\u003cspan\u003e, dated September 2, 2026, identifies the gemstone as natural spinel with the trade name \u003c\/span\u003e\u003cspan\u003eBlue Cobalt Spinel\u003c\/span\u003e\u003cspan\u003e. It records \u003c\/span\u003e\u003cspan\u003eSri Lankan origin\u003c\/span\u003e\u003cspan\u003e, \u003c\/span\u003e\u003cspan\u003eno heat – no treatment\u003c\/span\u003e\u003cspan\u003e, and a \u003c\/span\u003e\u003cspan\u003estrong reaction under the cobalt\/chromium filter\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGemstone:\u003c\/span\u003e\u003cspan\u003e Natural Spinel\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e \u003c\/span\u003e\u003cspan\u003eTrade Name:\u003c\/span\u003e\u003cspan\u003e Blue Cobalt Spinel\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e \u003c\/span\u003e\u003cspan\u003eWeight:\u003c\/span\u003e\u003cspan\u003e 2.81 carats\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e \u003c\/span\u003e\u003cspan\u003eOrigin:\u003c\/span\u003e\u003cspan\u003e Sri Lanka\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e \u003c\/span\u003e\u003cspan\u003eColor:\u003c\/span\u003e\u003cspan\u003e Blue\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e \u003c\/span\u003e\u003cspan\u003eShape:\u003c\/span\u003e\u003cspan\u003e Oval\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e \u003c\/span\u003e\u003cspan\u003eDimensions:\u003c\/span\u003e\u003cspan\u003e 9.30 × 7.39 × 5.51 mm\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e \u003c\/span\u003e\u003cspan\u003eCrown Cut:\u003c\/span\u003e\u003cspan\u003e Double Brilliant\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e \u003c\/span\u003e\u003cspan\u003ePavilion Cut:\u003c\/span\u003e\u003cspan\u003e Step (3)\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e \u003c\/span\u003e\u003cspan\u003eTreatment:\u003c\/span\u003e\u003cspan\u003e No Heat – No Treatment\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e \u003c\/span\u003e\u003cspan\u003eCobalt\/Chromium Filter:\u003c\/span\u003e\u003cspan\u003e Strong Reaction\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e \u003c\/span\u003e\u003cspan\u003eReport:\u003c\/span\u003e\u003cspan\u003e GFCO Gem Lab — AAP95839\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e \u003c\/span\u003e\u003cspan\u003eCondition:\u003c\/span\u003e\u003cspan\u003e Loose Gemstone\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e \u003c\/span\u003e\u003cspan\u003ePrice:\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003e$6,000\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAt nearly three carats, this documented Sri Lankan cobalt spinel offers an unusual combination of \u003c\/span\u003e\u003cspan\u003esize, natural blue coloration, untreated status and laboratory identification\u003c\/span\u003e\u003cspan\u003e. It is equally suited to a serious colored-gem collection or as the centerpiece of a bespoke fine-jewelry design.\u003c\/span\u003e\u003c\/p\u003e","brand":"Rogue Valley Gem Exchange ","offers":[{"title":"Default Title","offer_id":52407613980968,"sku":null,"price":6000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/4059\/6008\/files\/IMG-6393.png?v=1789727598","url":"https:\/\/shop.roguevalleygemexchange.com\/products\/2-81-carats-natural-cobalt-spinel-sri-lanka-gfco-certified","provider":"Rogue Valley Gem Exchange ","version":"1.0","type":"link"}