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Diamonds are the hardest mineral known to man. They have a hardness rating of 10. Iron's hardness is 8.5.
Diamonds are very useful when it comes to jewellery and saw blades and even super sharp surgical scalpels.
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Many countries in Southern Africa mine diamonds. Namibia, Zimbabwe, Swaziland and even Lesotho export diamonds.
Diamonds are mainly clear but you can find red, yellow, black, white, green, grey and vivid blue.
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There is a legend it was stolen by a French archeologist from a statue eye and whoever owned it was cursed.