Abrasives are sharp, hard materials used to grind softer surfaces. Abrasives have natural abrasives and artificial abrasives two categories. According to the hardness of the classification of superhard abrasive and ordinary abrasive two categories. Abrasives range from softer household descaling agents and gem abrasives to the hardest material, diamond. Abrasives are essential materials in the manufacture of every kind of precision products. Many natural abrasives have been replaced by artificial abrasives. With the exception of diamond, the properties of natural abrasives are not very stable, but they still have their use value. Diamond, the hardest abrasive, is produced mainly in South Africa, accounting for 95% of the world’s total production, with the rest in Brazil, Australia, Guyana and Venezuela. Industrial diamonds range from off-white to black. After grinding, grinding wheels, abrasive belts, polishing wheels and grinding powder can be made。