Oval Cut Lab Created Green Sapphire GemstoneThese loose oval faceted cut lab created green 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 Grown Sapphire Specs: Sizes: 6 x 4 mm 0. 59ct, 7 x 5 mm 1. 08ct, 8 x 6 mm 1. 75ct Treatment: Lab Created The sapphire in the pictured ring was 7 x 5 mm.