Black diamond, also known as black diamond, has a black porous structure and its hardness is equivalent to that of other diamonds. It only exists in Brazil and Central Africa. Black diamonds mostly exist in the form of irregular or round fragments, so they are widely used in industry. With the development of the times, black diamonds are also used in the field of jewelry, and because of scarcity, the value is quite expensive.

Black diamond (also known as black diamond or Carbonad) is a kind of natural polycrystalline diamond, which is found in alluvial deposits in Central Africa and Brazil, but not in Qingbaili rock where diamonds are usually found. The natural color of black diamonds is black or dark gray, which is more porous than other diamonds. Because there are many tiny black crystals, there are usually polymeric polycrystals the size of peas or larger.