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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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Colour Change in Alexandrite
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Alexandrite Description

Alexandrite, with its chameleon-like qualities, is a rare variety of the mineral chrysoberyl. Its colour can be a lovely green in daylight or fluorescent light, changing to brownish or purplish red in the incandescent light from a lamp or candle flame.

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Mohs Scale
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Alexandrite Care and Cleaning Guide

Learn about alexandrite's durability and how to care for your alexandrite jewellery.

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