{"product_id":"round-lab-created-ruby-cabochon-4-8mm","title":"Round Lab-Created Ruby Cabochon","description":"\u003cp\u003eA vibrant, professional-grade gemstone for jewelry making and resale, this round lab-created ruby cabochon is composed of \u003cstrong\u003eman-made corundum\u003c\/strong\u003e — sharing the same chemical composition, crystal structure, and hardness as its natural counterpart. It delivers \u003cstrong\u003eexcellent clarity\u003c\/strong\u003e and \u003cstrong\u003evivid, even coloration\u003c\/strong\u003e at a fraction of the cost of mined ruby, making it an ideal choice for production jewelry, custom settings, and retail display pieces.\u003c\/p\u003e\u003cp\u003eRuby — known in Sanskrit as the \u003cem\u003e\"King of Gems\"\u003c\/em\u003e — has been among the most prized gemstones throughout history. As the most valuable variety of corundum, it commands the highest per-carat price of any colored stone. The rich red hue is produced by trace amounts of chromium, with color ranging from orangey red to purplish red. Lab-created ruby reproduces this color and hardness with consistency, batch after batch.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMan-made corundum with the same chemical composition as natural ruby\u003c\/li\u003e\n\u003cli\u003eMedium to dark purplish red color with vivid, even saturation\u003c\/li\u003e\n\u003cli\u003eEye-clean clarity — free of visible inclusions to the naked eye\u003c\/li\u003e\n\u003cli\u003eMohs hardness of 9 — excellent durability for everyday wear\u003c\/li\u003e\n\u003cli\u003eRound cabochon cut — suited for bezel, prong, and channel settings\u003c\/li\u003e\n\u003cli\u003eJuly birthstone — popular for custom and commemorative jewelry\u003c\/li\u003e\n\u003cli\u003eConsistent color and clarity across sizes, ideal for production runs\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eStone Type\u003c\/th\u003e\n\u003ctd\u003eLab-created ruby (synthetic corundum)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCut\u003c\/th\u003e\n\u003ctd\u003eRound cabochon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eMedium to dark purplish red\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eClarity\u003c\/th\u003e\n\u003ctd\u003eEye-clean\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTreatment\u003c\/th\u003e\n\u003ctd\u003eSynthetic (color and clarity achieved during growth)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMohs Hardness\u003c\/th\u003e\n\u003ctd\u003e9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBirthstone Month\u003c\/th\u003e\n\u003ctd\u003eJuly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eAvailable Options\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003ePart #\u003c\/th\u003e\n\u003cth\u003eDiameter\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e931-704\u003c\/td\u003e\n\u003ctd\u003e4mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e931-705\u003c\/td\u003e\n\u003ctd\u003e5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e931-706\u003c\/td\u003e\n\u003ctd\u003e6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e931-708\u003c\/td\u003e\n\u003ctd\u003e8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eNotes\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eClean with warm, soapy water; ultrasonic and steam cleaners are generally safe for this stone type.\u003c\/li\u003e\n\u003cli\u003eSome minor inclusions may be present — completely inclusion-free rubies are rare even in lab-created material.\u003c\/li\u003e\n\u003cli\u003eHeat treatment is standard practice for natural rubies; synthetic varieties achieve their color and clarity during the growth process without additional treatment.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Otto Frei","offers":[{"title":"4mm","offer_id":47551799066838,"sku":"931-704","price":2.55,"currency_code":"USD","in_stock":true},{"title":"5mm","offer_id":47551799099606,"sku":"931-705","price":3.35,"currency_code":"USD","in_stock":true},{"title":"6mm","offer_id":47551799132374,"sku":"931-706","price":4.45,"currency_code":"USD","in_stock":true},{"title":"8mm","offer_id":47551799165142,"sku":"931-708","price":4.2,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/round-lab-created-ruby-cabochon-otto-frei.jpg?v=1719954610","url":"https:\/\/www.ottofrei.com\/ja\/products\/round-lab-created-ruby-cabochon-4-8mm","provider":"Otto Frei","version":"1.0","type":"link"}