Within the more than 2,000 years of its exploitation, the mine delivered just 130 tons of diamonds. Since diamond-containing rock features only an average of 1/20,000,000 in diamonds, some 3 billion tons of rock, sand and boulders had to be processed in the Kimberley Mine – 1.8 tons for a single ct. Diamond is made of pure carbon (c), same as soot. This means that burned toast chemically equals diamond. The special feature of diamond is the tetrahedral formation of its carbon atoms. Every C atom is connected with four neighbor atoms by a covalent chemical binding.