- noun a very hard transparent crystalline form of carbon, used as a gemstone, in abrasives and in cutting tools
- An allotropic form of the chemical element carbon, occurring as crystals. It is the hardest substance known, and as such has an assigned value of 10 on the Mohs scale. It is a precious stone, has extremely high thermal conductivity, a high refractive index, and may be transparent, translucent, or colored. Its applications include its use in cutting and grinding tools, optical windows, lasers, and semiconductors.
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