.925 Sterling Silver Faceted Round-Cut Prong-Set Lab-Grown Diamond Gemstone(S): Lab-Grown Blue Sapphire & White Sapphire Approximately 18In Long With 2In Extender Spring Ring Clasp Closure It Is Customary To Treat Most Gemstones To Achieve Enhanced Color And Durability. Some Of These Treatments May Not Be Permanent, And May Require Special Care. Please Note: In Product Titles Ct. Tw. Refers To The Total Carat Weight Of All Diamonds And/Or Gemstones Combined.