1 Carat Princess Cut Diamond Very Good Cut I SI2 IGI. This 1 carat loose diamond features Princess Cut shape and a Very Good cut. This diamond has been certified by IGI diamond laboratory as I color and clarity grade of SI2. Additional loose diamond details: diamond table size: 69.00; diamond girdle: Slightly Thick to Thick; faceted diamond measurements: 5.43 5.35 3.70; diamond polish: VG; diamond symmetry: GD; diamond culet: PO; diamond fluorescence; Slight. James Allen loose diamond Product ID: 104641-US. See an actual photograph of this certified 1 carat Very Good cut diamond.