1.High grade single crystal diamond 2.fine particle and good shape 3.low impuritity. Item: big ... pure Size: 1.0mm, 1.5mm, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3.0-4.0mm Weight: 1ct for 5pcs, 1ct for ... regular crystal shape, high mechanic strength, beolonging to middle grade, containing more regular crystal, suitalbe for grinding and free-cutting tools, grinding wheels ...