摩氏硬(ying)(ying)(ying)(ying)度(du)(du)(du)10,新摩氏硬(ying)(ying)(ying)(ying)度(du)(du)(du)15,顯(xian)微(wei)(wei)硬(ying)(ying)(ying)(ying)度(du)(du)(du)10000kg/mm2,顯(xian)微(wei)(wei)硬(ying)(ying)(ying)(ying)度(du)(du)(du)比(bi)石英高1000倍(bei),比(bi)剛(gang)玉高150倍(bei)。金剛(gang)石硬(ying)(ying)(ying)(ying)度(du)(du)(du)具有方向性,八面(mian)體晶(jing)面(mian)硬(ying)(ying)(ying)(ying)度(du)(du)(du)大(da)(da)于(yu)菱形十二面(mian)體晶(jing)面(mian)硬(ying)(ying)(ying)(ying)度(du)(du)(du),菱形十二面(mian)體晶(jing)面(mian)硬(ying)(ying)(ying)(ying)度(du)(du)(du)大(da)(da)于(yu)六面(mian)體晶(jing)面(mian)硬(ying)(ying)(ying)(ying)度(du)(du)(du)。
依(yi)照摩氏(shi)硬(ying)度標準(Mohs hardness scale)共(gong)分(fen)10級,鉆石(金剛石)為(wei)(wei)(wei)最(zui)高(gao)級第10級;如小(xiao)刀(dao)其硬(ying)度約(yue)為(wei)(wei)(wei)5.5、銅(tong)幣約(yue)為(wei)(wei)(wei)3.5至(zhi)(zhi)4、指(zhi)甲約(yue)為(wei)(wei)(wei)2至(zhi)(zhi)3、玻璃硬(ying)度為(wei)(wei)(wei)6。