Diamond Hardness.

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Diamond is one of the most hardest natural material known to mankind; hardness of a diamond is with respect to its resistance to scratching. Diamond has a hardness of 10 on Mohs scale of mineral hardness. Diamond's hardness has been known since the historic period preceding the Middle Ages in Europe, and is the source of its name. The hardest diamonds in the world were found from the New England area in New South Wales, Australia. These diamonds are generally small, perfect to semiperfect octahedra, and are used to polish other diamonds.