Cut and polished diamond. Diamond is a naturally occurring form of carbon that has crystallised under great pressure. Pure crystals are colourless and

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Cut and polished diamond. Diamond is a naturally occurring form of carbon that has crystallised under great pressure. Pure crystals are colourless and transparent, and can be polished to sparkle in the light. Diamond is the hardest known mineral. Poorer quality specimens are used in industry, mainly as cutting and grinding tools.

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Photo credit: © LAWRENCE LAWRY/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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Keywords: carbon, crystal, crystalline, cut, diamond, earth, expensive, gem, gemstone, geology, hardest, mineral, polished, precious, rock, science, shiny, sparkling, stone, valuable