Diamond | Definition, Properties, Color, Applications, & Facts
https://www.britannica.com/topic/diamond-gemstone
WEBMar 8, 2024 · diamond, a mineral composed of pure carbon. It is the hardest naturally occurring substance known; it is also the most popular gemstone. Because of their extreme hardness, diamonds have a number of important industrial applications. The hardness, brilliance, and sparkle of diamonds make them unsurpassed as gems.
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