摩(mo)氏(shi)(shi)硬(ying)度(du)(du)(du)10，新摩(mo)氏(shi)(shi)硬(ying)度(du)(du)(du)15，顯微(wei)硬(ying)度(du)(du)(du)10000kg/mm2，顯微(wei)硬(ying)度(du)(du)(du)比(bi)石英高1000倍，比(bi)剛(gang)玉高150倍。金剛(gang)石硬(ying)度(du)(du)(du)具有(you)方向性，八(ba)面(mian)(mian)(mian)體(ti)晶面(mian)(mian)(mian)硬(ying)度(du)(du)(du)大于(yu)菱形十二面(mian)(mian)(mian)體(ti)晶面(mian)(mian)(mian)硬(ying)度(du)(du)(du)，菱形十二面(mian)(mian)(mian)體(ti)晶面(mian)(mian)(mian)硬(ying)度(du)(du)(du)大于(yu)六(liu)面(mian)(mian)(mian)體(ti)晶面(mian)(mian)(mian)硬(ying)度(du)(du)(du)。

依(yi)照摩(mo)氏硬度標準(Mohs hardness scale)共分10級(ji)，鉆石(金剛石)為最高級(ji)第10級(ji)；如(ru)小(xiao)刀其硬度約為5.5、銅(tong)幣約為3.5至(zhi)4、指甲(jia)約為2至(zhi)3、玻璃硬度為6。