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WebA few white, gray and black diamonds are also cut and used as gems. Most industrial-grade diamonds are brown, yellow, gray, green and black crystals that lack the color and … WebApr 7, 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, … Diamond gems have been cut in many different shapes. The brilliant cut is the … gemstone, any of various minerals highly prized for beauty, durability, and rarity. A … das oil and gas
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