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Since tourmaline consists of a very large group of related gemstones, most tourmaline is traded under very colour-specific varietal names. Some of the more popular trade names include pink-red ' rubellite ', blue-green 'paraiba', blue 'indicolite' and multicoloured ' watermelon tourmaline '.
The rarest colors of tourmaline are the unusual blue and green colored stones found only in the Batalha mine in Paraiba, Brazil. These stones, which have been described as having an electric, almost neon glow about them, get their unique color from the presence of copper.