CERTIFICATION: IGL Certified. CVD Lab-Grown Diamond 50 Pieces Lot Round, D Color, IF Clarity, IGL 6MHB. CVD Lab-Grown Diamond 17 Pieces Lot Round, D Color, IF Clarity, IGL 6MHB. 4.1 Ct Lab Grown CVD Diamond Princess Cut VVS1 IGL Certified Loose Gemstone 6MHB.