Color - Diamonds are found in nature in all colors of the rainbow, and some are very rare. Where Diamonds are found. Nowadays nineteen countries produce diamonds, the majority of which are in Africa. Diamond is pure crystallised carbon. Rough diamonds come in different shapes and sizes.
Diamonds are the hardest natural substance known to man.
Only a diamond can scratch the surface of, or cut through, another diamond. This is why diamonds should never be stored close together. Diamonds are many millions of years old. The formation of diamonds began many millions of years ago in the depths of the earth when carbon was crystallised by tremendous heat and pressure. The diamond-bearing ore rosa to the surface through volcanic eruptions.