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Garnets under daylight-equivalent (left) and incandescent light (right).
Discovery of Colour-Change Chrome Grossular Garnets from Ethiopia

The first known group of colour-change gem-quality chrome grossular garnet, reportedly from Ethiopia, is examined in GIA’s Carlsbad lab.

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A round, bright red gem displayed on a dark gray background.
Article
The Red Hot Gems of Summer

These red, pink and orange hued gems evoke passion and excitement – and are sure-fire accessories for sultry summer days.

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Wavers with calculated color panels.
Pyrope-Spessartine Colour-Change Garnet with a High Grossular Component

A colour change in rough garnet is observed and plotted in GIA’s Carlsbad lab.

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Çiğdem Lüle behind a podium.
Article
Researcher and Educator Uses Gems to Explore Ancient Civilisations

Çiğdem Lüle uses her expertise to teach about the gem market and develop the multidisciplinary research subject of archaeo-gemmology.

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Summer 2016 Gems & Gemology Cover
Article
Summer 2016 G&G: Diamonds from Diavik, Responsible Sourcing and Fabergé Cossack Figures

A summary of the content found in the Summer 2016 issue of Gems & Gemology.

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Article
Pyrope Garnet and Montana Sapphires Highlight Winter 2015 G&G

G&G Brief presents an overview of the content of the Winter 2015 issue of Gems & Gemology.

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Pink pyrope garnet seen under incandescent and daylight-equivalent light
Article
Vanadium and Chromium-Bearing “Colour-Change” Pyrope Garnet

Profiles interesting and attractive garnet, believed to have been mined in Tanzania, that shows a noticeable colour difference under incandescent and daylight-equivalent light.

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Article
Gem Mining in Cambodia

How to examine a sapphire crystal for cracks and inclusions.

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Summer 2012 Gem News International

A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewellery manufacturing techniques and industry trends.

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Autumn 2011 Gem News International

A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewellery manufacturing techniques and industry trends.

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