Abrasives are sharp, hard materials used to grind softer material surfaces. Abrasives are available in two categories: natural abrasives and synthetic abrasives. According to the hardness classification, there are two categories of super hard abrasives and ordinary abrasives. Abrasives range from softer household detergents, gem abrasives to the hardest material diamonds. Abrasives are essential for making every precision product. Many natural abrasives have been replaced by artificial abrasives. In addition to diamond, the performance of natural abrasives is not stable, but it still has its value. Diamond is the hardest abrasive, mainly in South Africa, accounting for 95% of the world's total production, followed by Brazil, Australia, Guyana and Venezuela. Industrial diamonds range from off-white to black. After milling, they can be used to make grinding wheels, abrasive belts, polishing wheels and abrasive powders.