Square Cushion Cut Lab Created Green Sapphire GemstoneThese loose square cushion 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: 5mm 0. 8ct, 6 mm 1. 3ct, 8mm 3. 3ct Treatment: Lab Created Some sizes may take 4 weeks to be custom made