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Glossary of watchmaking

Tourmaline

Tourmaline | トルマリン | 电气石

A dichroic gemstone that comes in all colours of the rainbow. Some crystals are bi or tri coloured. Tourmaline has the greatest colour range of any gemstone. Tourmaline has a hardness of 7-7.5 and a specific gravity of 3.02-3.25. It is doubly refractive.