Oval Cut Lab Created Blue Sapphire GemstoneThese loose oval cut lab created blue sapphire gemstones are available for a custom built ring by Nodeform Jewelry. Select your stone size, then select a ring setting that fits the shape and size of the chosen stone. Add both to your cart and we'll create your ring! Lab Grown Sapphire Specs: Sizes: 6 x 4 mm ~0. 55ct, 7 x 5 mm ~1. 1ct, 8 x 6 mm ~1. 6ct, 9 x 7 mm ~2. 5ct Treatment: Lab Created