Princess Cut Lab Created Alexandrite GemstoneThese loose faceted square princess cut lab created Alexandrite 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 AlexandriteSpecs: Sizes: 5 mm 0. 8ct, 6 mm 1. 35ct, 6. 5 mm 1. 65ct Treatment: Lab Created Blue green by daylight and purple red by incandescent light,