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

C. B. Dissanayake and M. S. Rupasinghe, September 1, 1993

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

Sri Lanka: The Gem Island

Peter C. Zwaan, June 1, 1982

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

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

Article

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.

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.

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.

Article

Iolite Quality Factors

Learn about the factors that make iolite so desirable.

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

Article

Iolite History and Lore

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

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