RANDOM QUANTITY
DIAMOND
. Diamond is a carbon allotrope (the other carbon allotropes are graphite, fullerene, carbine, carbon nanotubes, diamond nanostructures, lonsdaleite and others), in which the carbon atoms are arranged isometrically in a hexoctahedral crystal lattice. Its hardness and high light dispersion make it a useful material in both industry and jewelery. Diamond is the hardest known mineral of natural origin, which makes it an excellent abrasive. To obtain polished diamonds, it is only possible to process them under high pressure and high temperature with other diamonds (known as Type-II diamonds) which are harder or with substances that are harder than the diamond itself. These substances can be borazone, ultra-hard fullerite or diamond nanostructures. It also means that the diamond perfectly retains its surface polish - its brilliant shine. The diamond has a melting point of 3547 ° C - the highest of all minerals. Diamond is traditionally considered to be the most valuable gemstone.