Round Cut Lab Created Ruby GemstoneThese loose round faceted cut lab created Ruby 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 Ruby Specs: Sizes: 4 mm 0. 4ct, 4. 5 mm 0. 5ct, 5 mm 0. 67ct, 5. 5 mm 0. 95ct, 6 mm 1. 2ct, 6. 5 mm 1. 5ct, 7 mm 1. 85ct, 7. 5 mm 2. 0ct, 8 mm 2. 75ct Treatment: Lab