... 4.0mm Weight: 1ct for 5pcs, 1ct for 7pcs, 1ct for 8pcs, 1ct for 9pcs, 1ct for 12 pcs, 1ct for 17pcs etc. Grade: ... YWD 70 synthetic diamond can be used as jewelleries. Application: jewellery processing tools, dressing tools, petrol drilling, construction, engineering, ... good diaphaneity, high impact strength and thermal stability, suitable for high grade cutting, drilling, and grinding tools. YWD 2160 ...