DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Diamond is a variety of carbon formed deep in the earth under conditions of extremely high pressure and heat. Diamonds of high value, as used in jewellery, are very pure carbon, flawless and colourless or with faint colouring. Industrial diamonds are any diamonds that are meant for use in industrial processes, like cutting, grinding and polishing. They may be mined, natural diamonds of low purity, but can also be produced synthetically.
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