Round Cut White Sapphire Crown Necklace in Gold SayaBling Grown With Love Lab Grown Sapphire (5 ct. t.w.) & Lab Grown Diamond (1 Lab Grown Sapphire & Natural Diamond Necklace Sunshine Jewelers Crescent Oval Cut Lab Cornflower Sapphire Necklace For Women. Includes: A matching box. Style: Minimalist Material: 925 sterling silver, Platinum plated, Zircon, Lab grown sapphire Care: Avoid wearing during exercise, as sweat will react with the jewelry to produce silver chloride and copper sulfide, which causes the jewelry to deteriorate and corrode over time. Imported Product measurements: Chain length: 15. 7 in Extension chain length: 2 in Sapphire: 0. 715 carat Zircon: 1 carat Weight: 0. 15 oz (4. 36 g)