Undoubtedly the most popular of the gemstones, accounting for upward of 80 percent of all jewelry sales in terms of value. The diamond is hardest natural mineral known to exist, and was formed millions of years ago from pure carbon under extremely high pressure and temperatures, deep below the crust of the earth. The majority of diamonds mined worldwide cannot be used in jewelry, but, because of their hardness, have a wide variety of industrial uses. Gem quality diamond are most commonly colorless and near colorless, but diamonds come in all colors.

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