{"product_id":"1-76-carat-natural-cobalt-blue-spinel-tanzania","title":"1.76 Carat Natural Cobalt Blue Spinel – Tanzania","description":"\u003cp\u003e\u003cspan\u003eAn impressive \u003c\/span\u003e\u003cspan\u003e1.76 carat natural cobalt spinel from Tanzania\u003c\/span\u003e\u003cspan\u003e, featuring a rich, sophisticated blue color and a striking octagonal step cut.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe broad step facets give this gemstone a bold architectural appearance, producing flashes of blue across the stone as lighting and viewing angle change. Its deep navy-to-steel-blue character makes it an excellent choice for a collector seeking something considerably less common than traditional blue sapphire.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe accompanying gemological report identifies the gemstone specifically as \u003c\/span\u003e\u003cspan\u003eNATURAL COBALT SPINEL\u003c\/span\u003e\u003cspan\u003e, with \u003c\/span\u003e\u003cspan\u003eTanzanian origin\u003c\/span\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cspan\u003eno indication of heat treatment\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGemstone Details\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003eGemstone:\u003c\/span\u003e\u003cspan\u003e Natural Cobalt Spinel\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eWeight:\u003c\/span\u003e\u003cspan\u003e 1.76 carats\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eColor:\u003c\/span\u003e\u003cspan\u003e Blue\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eOrigin:\u003c\/span\u003e\u003cspan\u003e Tanzania\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eShape\/Cut:\u003c\/span\u003e\u003cspan\u003e Octagon Cut\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eMeasurements:\u003c\/span\u003e\u003cspan\u003e 6.68 × 6.30 × 4.6 mm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eTreatment:\u003c\/span\u003e\u003cspan\u003e No indication of heat\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eHardness:\u003c\/span\u003e\u003cspan\u003e 8 on the Mohs scale\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eCondition:\u003c\/span\u003e\u003cspan\u003e Loose gemstone\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eGemological Report:\u003c\/span\u003e\u003cspan\u003e AIG – American International GemLab\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eReport No.:\u003c\/span\u003e\u003cspan\u003e GEM20260831178597\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eThe Rarity of Cobalt Spinel\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBlue spinel is among the more unusual members of the spinel family. Cobalt-bearing examples have developed a particularly strong following among collectors because cobalt can contribute to the blue coloration found in certain exceptional natural spinels.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUnlike many colored gemstones encountered in the marketplace, the accompanying report for this specimen states \u003c\/span\u003e\u003cspan\u003eno indication of heat\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAt \u003c\/span\u003e\u003cspan\u003e8 on the Mohs scale\u003c\/span\u003e\u003cspan\u003e, spinel also offers excellent durability for fine jewelry. This stone could remain as part of a loose-gem collection or become the centerpiece of a custom-designed ring or pendant.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCollector Gemstone — $3,500\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe combination of \u003c\/span\u003e\u003cspan\u003ecobalt spinel identification, Tanzanian origin, 1.76-carat size, natural unheated status, and distinctive octagonal cut\u003c\/span\u003e\u003cspan\u003e makes this a compelling specimen for the serious colored-gemstone collector.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe exact gemstone pictured is the gemstone you will receive.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMacro photography and specialized lighting are used to show the gemstone’s details. Natural inclusions, reflections, and variations in color may appear more prominent under magnification than during normal viewing.\u003c\/span\u003e\u003c\/p\u003e","brand":"Rogue Valley Gem Exchange ","offers":[{"title":"Default Title","offer_id":52433402593576,"sku":null,"price":3500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/4059\/6008\/files\/IMG-6469.png?v=1789809253","url":"https:\/\/shop.roguevalleygemexchange.com\/products\/1-76-carat-natural-cobalt-blue-spinel-tanzania","provider":"Rogue Valley Gem Exchange ","version":"1.0","type":"link"}