... for 12 pcs, 1ct for 17pcs etc. Grade: YWD 25, YWD 30, YWD 50, YWD 70 for different purity. YWD 50 and 70 is ... processing etc. YWD 2290 consistent crystal color, regular shape, good trandparancy, high strength and great thermal stability, applied to make ... crystal shape, perfect cubic octahedron, good diaphaneity, high impact strength and thermal stability, suitable for high grade cutting, drilling, and ...