Gemstones

Indicolite

Dark blue tourmaline is called indicolite or, occasionally, indigolite. Indicolite is often heat-treated to lighten

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topaz

Topaz

Topaz occurs in a range of different colors: deep golden yellow topaz (sometimes called sherry

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sugilite

Sugilite

Sugilite is deep reddish purple to purple, semi-transparent to opaque, complex silicate of alkali metals,

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Staurolite

Opaque, cross-shaped staurolite “twins” are used in jewellery more often than the transparent stones, which

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