Knowledge on Diamond
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Diamond is the costliest gemstone and the hardest substance known. It is so hard that it can be only cut by another diamod.
Diamonds are formed at high temperature and pressure that exists over 100km below the earth's surface.
Diamond is artificially produced by heating graphite at a high temperature and pressure.
Diamond is generally colourless. However, the coloured varieties - yellow, brown, red, green, blue, grey or even black are found in nature. The colour arises due to metalic impurity.
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