... and good shape 3.low impuritity. Item: big size synthetic diamond (YWD) Color: Yellow pure Size: 1.0mm, 1. ... thermal stability, suitable for high grade cutting, drilling, and grinding tools. YWD 2160 complete crystal shape with full surface, ... containing more regular crystal, suitalbe for grinding and free-cutting tools, grinding wheels which work with medium load. yellow synthetic/ man-made diamond