{"product_id":"cobalt-blue-spinel-crystal-monkey-mine-an-phu-vietnam-5","title":"Cobalt Blue Spinel Crystal - Monkey Mine, An Phu, Vietnam","description":"\u003cp\u003e\u003cspan\u003eCobalt-bearing blue spinel crystal cluster from the Monkey Mine, An Phu, Vietnam. This piece consists of multiple intergrown spinel crystals showing a deep cobalt blue color, with natural crystal faces and areas of attached matrix preserved\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCobalt-colored spinel is exceptionally rare, with Vietnam recognized as one of the few sources producing this distinctive blue. Specimens from the Monkey Mine are especially noted for their saturated color, caused by trace amounts of cobalt incorporated into the spinel structure, making intact clusters like this desirable reference and collector examples\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e7.1 x 5.7 x 4.0 mm \/ 1.635 carats \u003c\/p\u003e\n\u003cp\u003eEstimate: $135 - $150\u003c\/p\u003e","brand":"Gem Dragon Auctions","offers":[{"title":"Default Title","offer_id":51920268034361,"sku":"12910x","price":115.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0699\/0037\/0233\/files\/UN-5331_k4nxxtj9ulm_2026-02-04-09-12-28.jpg?v=1770304852","url":"https:\/\/gemdragonauctions.com\/products\/cobalt-blue-spinel-crystal-monkey-mine-an-phu-vietnam-5","provider":"Gem Dragon Auctions ","version":"1.0","type":"link"}