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Glossary of watchmaking

Iolite

Iolite | アイオライト | 堇青石

Iolite

Iolite is a transparent, violet-blue, light blue, or yellow-gray mineral. Iolite is pleochroic; a single stone will show up to 3 colours (in this case violet-blue, light blue, and yellow-gray). Iolite has a hardness of 7 - 7.5 and is found in Sri Lanka, India, Madagascar and Myanmar (Burma).