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Faceted blue zircons
Reversible Colour Modification of Blue Zircon by Long-Wave Ultraviolet Radiation

Determines whether blue zircon, inadvertently altered to brown by exposure to long-wave UV radiation, can be restored to its original colour through the use of incandescent light.

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Winter 2011 G&G Lab Notes

This section, from the Winter 2011 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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Zircon from the Harts Range, Northern Territory, Australia

Gem-quality zircon from a relatively underdeveloped locality in the Harts Range of central Australia is described.

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The Elahera Gem Field in Central Sri Lanka

The Elahera gem field currently provides approximately 35% of the gemstones exported from Sri Lanka.

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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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