... is with smooth crystal face,high compression strength synthetic diamond 1.Usage:lapping, grinding and polishing of optical ... of optical objects, magnet heads, gems and electroplated articles. Diamond micron powder :Grit:0-0.5, 0-1, 0 ... -40, 40-60 ,50-70 ,60-80 Synthetic diamond RVD: 30/35,35/40,40/45,45/50,50 ... 270/325,325/400,400/500,500/600* Special sizes can be tailor-made as per customers'requirement