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A large group of people outside on GIA’s Carlsbad, California  campus.
Article
Guardians of Trust: GIA’s Innovative Research, Instruments and Services

GIA’s services and instruments have grown in importance and impact as new gem treatments and laboratory-grown gems have entered the market.

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Alexandrite cabochon in fluorescent (left) and incandescent light (right).
Cat’s-Eye Alexandrite with Unique Inclusion Pattern

Examination of a chatoyant alexandrite cabochon.

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Three pieces of labradorite with yellow, blue and green flashes of color.
Article
Optical Effects of Phenomenal Cabochons

Learn how the structure, inclusions and properties of some gemstones interact with light to create unusual visual effects.

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Worker attaching wax forms
Article
Shenzhen: The Frontier of China’s Gem and Jewellery Industry

All jewellery professionals are familiar with the city of Shenzhen, a global jewellery manufacturing centre and a leader of China’s fast-growing gem and jewellery industry. Join the GIA team as we tour the city and discover more about its leading jewellery brands.

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Article
The Glory of Green Gems

Green gemstones, which can uplift and heal our spirits, have been popular gem choices ever since we began to adorn ourselves with jewellery.

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Article
Gemmologist’s Black Opal Ring Wows Consumers and Trade Media

GIA graduate Niveet Nagpal, president and head designer of Omi Privé, showcases his love of gems and brings them to life in his designs.

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“Red” Chrysoberyl versus Alexandrite: The Impact of Elevated Chromium Levels on Colour and Colour-Change Properties

Overview and commentary on the 2014 Journal of Gemmology article “Purple to Reddish Purple Chrysoberyl from Brazil”.

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Large moissanite crystal
Record-Size Natural Moissanite Crystals Discovered in Israel

Natural moissanite crystals found in Israel has broken world records, with evidence of larger crystals in the area.

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14 ornaments of coral veneer glued to matrix
Composite Coral Veneer Glued to Artificial Matrix

Items presented as red coral are revealed by testing to be composite coral veneers over an artificial matrix.

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Prasiolite with Brazil-law twinning in optic-axis direction
Prasiolite with Inclusion Influenced by Brazil-Law Twinning

A prasiolite specimen displaying Brazil-law twinning, usually seen in the amethyst variety of quartz, is examined.

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