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A Prospectors’ Guide Map to the Gem Deposits of Sri Lanka

Sri Lanka is world famous for its gem wealth, but the actual extent of the deposits has never been determined.

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Sri Lanka: The Gem Island

An overview of the many types of gem-quality material, and its inclusions, currently found in Sri Lanka.

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The cutter took full advantage of this iolite’s colour and transparency, fashioning it into a uniquely carved gem, ready for use in jewellery. – Lydia Dyer, Gem courtesy John Dyer & Co.
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Iolite Quality Factors

Learn about the factors that make iolite so desirable.

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Iolite has a long history of use as an adornment and possibly as a navigation tool. – Robert Weldon
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Iolite History and Lore

Iolite has a long history of use as an adornment and possibly as a navigation tool.

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The colour of fine-quality iolite can sometimes rival that of sapphire or tanzanite. – Robert Weldon
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Iolite Description

This silicate of aluminium, iron, and magnesium has two distinctive features - a beautiful, violetish blue through slightly violetish blue hue derived from iron and a striking, eye-visible pleochroism.

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Gubelin Cordierite - Iolite 34802 300x169
Article
GIA's Gübelin Gem Project: Various Gems, Barite - Cuprite

Among the collection assembled by Dr Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

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