Round Cut Lab Created Blue Sapphire GemstoneThese loose round faceted cut lab created blue sapphire gemstones are available for a custom built ring by Nodeform Jewelry. Select your stone size & type, then select a ring setting that fits the shape and size of the selected stone. Add both to your cart and we'll create your ring! Lab Created Sapphire Specs: Sizes: 5 mm 0. 7ct, 5. 5 mm 1. 95ct, 6 mm 1. 2ct, 6. 5 mm 1. 5ct, 7 mm 1. 85ct, 7. 5 mm 2. 0ct, 8 mm 2. 75ct, 9 mm 4. 1ct Treatment: Lab