Of all precious stones the diamond has the simplest composition; it is merely crystallized carbon. Carbon is present in every plant, mineral and animal on earth. Diamonds comes typically from the mines in South Africa. Other countries like India, Brazil, Australia and the United States there has been found diamonds too.
An emerald is almost certainly the rarest of all precious stones and is measured by some to be even more valuable than the diamond. If you compare it with other precious stones the emerald is unique in its occurrence in nature. Because it is found in the rock in which it was formed. Different from diamonds, sapphires and rubies, the emerald never occur in gem gravels. The first known locality where emeralds we View the rest of this article