Added on 08/06/09
Diamonds have the longest endurance of any substance known on Earth. Carbon dating has established that diamonds, on the average, are 3.4 billion years of age. They consist of pure carbon and there is no chemical difference between them and carbon...
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Diamonds have the longest endurance of any substance known on Earth. Carbon dating has established that diamonds, on the average, are 3.4 billion years of age. They consist of pure carbon and there is no chemical difference between them and carbon powder (the lead pencil center). Obviously, however, the physical difference between carbon powder and a diamond is fascinating. Diamonds are created from a basketball-sized piece of pure carbon that becomes white-hot. It is squeezed to the size of a small pearl, turning from black to clear in the process and becoming the hardest material known to humans, ranking a 10.0 on the Mohs Scale . Because they are so hard, diamonds can only be ground and polished by using diamond dust that has been ground from other diamonds. See less 
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