Diamond Properties Diamond is the hardest substance known and is given a value of 10 in the Mohs hardness scale, devised by the German mineralogist Friedrich Mohs to indicate relative hardness of substances on a rating scale from 1 to 10. Its hardness, exhibited in its resistance to scratching, is not a constant quantity, but varies in every diamond with the crystallographic direction, being greater on surfaces parallel to the octahedron than on those parallel to the dodecahedron …showed first 75 words of 426 total…

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