{"product_id":"oval-black-onyx-cabochon-6x4-25x18mm","title":"Oval Black Onyx Cabochon","description":"\u003cp\u003e\u003cstrong\u003eBlack Onyx, also known as black agate, is dyed black chalcedony.\u003c\/strong\u003e Chalcedony is composed of microscopic quartz crystals not visible to the naked eye. Natural black chalcedony is exceptionally rare — virtually all black chalcedony available commercially is grey chalcedony that has been chemically treated to achieve its rich, uniform black appearance. Black Onyx is the top-selling chalcedony in the market and has a long history in fine jewelry, most notably as a staple of Art Deco design. These oval cabochons are available in a wide range of sizes, making them well-suited for rings, pendants, brooches, and other metalwork settings.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDyed black chalcedony — the same material historically sold as Black Onyx\u003c\/li\u003e\n\u003cli\u003eUniform opaque black color throughout\u003c\/li\u003e\n\u003cli\u003eOval cabochon cut — smooth domed top, flat back\u003c\/li\u003e\n\u003cli\u003eAvailable in 12 sizes from 6x4mm to 25x18mm\u003c\/li\u003e\n\u003cli\u003eSuitable for a wide range of setting styles and jewelry applications\u003c\/li\u003e\n\u003cli\u003eA classic choice for Art Deco-inspired and contemporary metalwork designs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eStone Type\u003c\/th\u003e\n\u003ctd\u003eBlack Onyx (dyed black chalcedony)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eChalcedony (microcrystalline quartz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTreatment\u003c\/th\u003e\n\u003ctd\u003eDyed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eUniform opaque black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShape\u003c\/th\u003e\n\u003ctd\u003eOval cabochon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCare\u003c\/th\u003e\n\u003ctd\u003eClean with warm, soapy water; ultrasonic and steam cleaning are generally safe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eAvailable Options\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003ePart #\u003c\/th\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-508\u003c\/td\u003e\n\u003ctd\u003e6x4mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-509\u003c\/td\u003e\n\u003ctd\u003e7x5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-510\u003c\/td\u003e\n\u003ctd\u003e8x6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-511\u003c\/td\u003e\n\u003ctd\u003e9x7mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-511A\u003c\/td\u003e\n\u003ctd\u003e10x8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-512\u003c\/td\u003e\n\u003ctd\u003e12x10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-512A\u003c\/td\u003e\n\u003ctd\u003e14x10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-513\u003c\/td\u003e\n\u003ctd\u003e14x12mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-514\u003c\/td\u003e\n\u003ctd\u003e16x12mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-515\u003c\/td\u003e\n\u003ctd\u003e18x13mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-517\u003c\/td\u003e\n\u003ctd\u003e20x15mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e947-519\u003c\/td\u003e\n\u003ctd\u003e25x18mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cp\u003eBlack Onyx is universally treated material — the dyed process is the industry standard for this stone and does not diminish its commercial value or desirability. Natural untreated black chalcedony is extremely rare and not typically available in the gem trade. When disclosing stone treatments to customers, note that this material is \u003cem\u003edyed\u003c\/em\u003e.\u003c\/p\u003e","brand":"Otto Frei","offers":[{"title":"6x4mm","offer_id":47551788056790,"sku":"947-508","price":1.8,"currency_code":"USD","in_stock":false},{"title":"7x5mm","offer_id":47551788417238,"sku":"947-509","price":0.6,"currency_code":"USD","in_stock":true},{"title":"8x6mm","offer_id":47551788089558,"sku":"947-510","price":1.9,"currency_code":"USD","in_stock":true},{"title":"9x7mm","offer_id":47551788122326,"sku":"947-511","price":2.0,"currency_code":"USD","in_stock":true},{"title":"10x8mm","offer_id":47551788155094,"sku":"947-511A","price":2.25,"currency_code":"USD","in_stock":true},{"title":"12x10mm","offer_id":47551788187862,"sku":"947-512","price":2.75,"currency_code":"USD","in_stock":true},{"title":"14x10mm","offer_id":47551788220630,"sku":"947-512A","price":3.0,"currency_code":"USD","in_stock":true},{"title":"14x12mm","offer_id":47551788253398,"sku":"947-513","price":3.25,"currency_code":"USD","in_stock":true},{"title":"16x12mm","offer_id":47551788286166,"sku":"947-514","price":4.0,"currency_code":"USD","in_stock":false},{"title":"18x13mm","offer_id":47551788318934,"sku":"947-515","price":5.4,"currency_code":"USD","in_stock":true},{"title":"20X15mm","offer_id":47551788351702,"sku":"947-517","price":4.5,"currency_code":"USD","in_stock":true},{"title":"25X18mm","offer_id":47551788384470,"sku":"947-519","price":8.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/oval-black-onyx-cabochon-otto-frei.jpg?v=1719954635","url":"https:\/\/www.ottofrei.com\/products\/oval-black-onyx-cabochon-6x4-25x18mm","provider":"Otto Frei","version":"1.0","type":"link"}