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Tourmaline
The tourmaline gemstone owes its name to the Sinhalese word "Toramalli", which means colorful. Ten varieties of tourmalines exist but only a few of them are used in jewelry. Varieties of tourmaline are often referred to by their natural color such as green tourmaline, pink tourmaline, purple tourmaline, blue tourmaline, and yellow tourmaline. Hardness: Tourmaline