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Hardness

Diamond Diamond

Hardness: 10
Colour: Variable - pale yellow, brown, grey, and also white, blue, black, reddish, greenish and colourless
Streak: White
Lustre: Adamantine
Other characteristics: The finest diamond crystals are transparent

Gemstone quality: Diamond is very hard and doesn't scratch easily. Its hardness and its natural beauty mean that diamond has always been a highly valued gemstone.
Industrial uses: Its hardness makes it a useful industrial mineral, coating saw blades, drill bits and other cutting tools. It is also used for cutting other diamonds because nothing else is hard enough.

Diamond ring Diamond saw blade

Diamond is used for its beauty as a gemstone, and for its hardness as a coating for saw blades and other cutting tools.

Return to Mohs scale to learn more about hardness.