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GIA Gem Project
Garnet

Often thought of as a deep red gemstone, garnet can also be yellow, orange, green or brown – any colour except blue.

Figure 9. The parcel of rough spinel on the left, reportedly from Tajikistan, contains pieces weighing up to 48.5 g. The seven faceted spinels on the right (9.04–28.16 ct) were fashioned from some of this rough.

Purplish Pink Spinel from Tajikistan: Before and After Cutting

Nicholas Sturman, March 1, 2009

Purplish Pink Spinel from Tajikistan: Before and After Cutting

A round, bright red gem displayed on a dark gray background.

Article

The Red Hot Gems of Summer

Sharon Bohannon, August 21, 2017

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

Garnets under daylight-equivalent (left) and incandescent light (right).

Discovery of Colour-Change Chrome Grossular Garnets from Ethiopia

Ziyin Sun, Aaron C. Palke, Nathan D. Renfro, Heidi Breitzmann, Dylan Hand, and Jonathan Muyal, August 9, 2018

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

Spring 2000 Gem News International

March 1, 2000

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.

Pyrope-Spessartine Colour-Change Garnet with a High Grossular Component

Ziyin Sun, Jonathan Muyal, and Aaron Palke, May 8, 2017

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

Article

Pyrope Garnet and Montana Sapphires Highlight Winter 2015 G&G

Russell Shor, February 1, 2016

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

Article

Summer 2016 G&G: Diamonds from Diavik, Responsible Sourcing and Fabergé Cossack Figures

Jennifer-Lynn Archuleta, August 3, 2016

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

Article

Researcher and Educator Uses Gems to Explore Ancient Civilisations

Jaime Kautsky, November 23, 2016

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

Spring 2004 Gem News International

March 1, 2004

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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