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The variety of colours is typical of the group of tourmalines. The name is derived from the Sinhalese word Turmali, which means “stone with mixed colours”. Tourmalines come in all colours and cover the entire colour spectrum within one colour group. In addition, there are usually several colours in just one crystal. There are many names for the different colour variations, for example rubellite for the red variety or indigolite for blue tourmalines. Tourmalines are easy to process and are therefore particularly popular gemstones for production of jewellery.