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yes, diamonds are the hardest substance known on earth

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Diamonds are assigned a hardness of 10 on Mohs hardness scale. But not all diamonds are equally hard. The hardest natural diamonds come from New South Wales, Australia, and are extensively used in polishing other diamonds.

There is a special process of treating ordinary diamonds with heat and pressure to improve their hardness. Boron nitride is often used as polisher of diamonds.

Splitting of a diamond may be done by the use of a hardened steel 'knife' which takes advantage of defects in the crystal lattice.

Diamonds are also cut using a laser.

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