UV-irradiated ruby
5
Coin
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Ruby (Ruby) is a gem-grade corundum mineral variant, the chemical composition of alumina (Al₂ O), its unique red is due to the crystal structure contains trace amounts of chromium. Ruby is a very hard and durable gemstone, with a hardness of on the Mohs scale, second only to diamonds. The color of ruby ranges from pink to deep red, and the intensity of the color depends on the amount of chromium in the crystal structure. Ruby usually exhibits a hexagonal crystal structure, and the crystal is usually prismatic with a flat base end face. Due to its beautiful color and high hardness, rubies are widely used in jewelry, such as rings, necklaces and bracelets.
