1 Carat Oval Cut Diamond Good Cut F SI2 IGI. This 1 carat loose diamond features Oval Cut shape and a Good cut. This diamond has been certified by IGI diamond laboratory as F color and clarity grade of SI2. Additional loose diamond details: diamond table size: 63.00; diamond girdle: Thick to Very Thick; faceted diamond measurements: ; diamond polish: VG; diamond symmetry: VG; diamond culet: PO; diamond fluorescence; None. James Allen loose diamond Product ID: 104553-US. See an actual photograph of this certified 1 carat Good cut diamond. aka