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Zircon

Zircon is a colourful gem with high refraction and fire that’s unfairly confused with cubic zirconia.

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Cushion Cut

This 21.05-ct. cushion cut, orange zircon is from Tanzania.

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Fall Colour

This gem displays a warm autumnal reddish brown.

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Seeing Double

Zircon’s strong double refraction causes double images of facets.

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Cinnamon Brown

Like this rare untreated 48.50-ct. crystal, zircon is often brownish.

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Pointed Cap

Zircon crystals are often four sided and capped with pyramid shapes.

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Ubiquitous Gem

Zircon crystals grow in many different types of rock.

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Tools

Research

A miner in northern Tanzania examines rhodolite.
Gemstone Guidebook Project

A project coordinated by GIA and the NGO Pact provides a valuable educational tool to women miners in Tanzania.

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Spring 2000 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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Five zircon samples studied for radioactive degradation of crystal structure.
Chemical Analysis of Zircon

Trace-element analysis is used to identify metamictisation, treatment and growth conditions of zircon.

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Article
GIA Gem Project
Zircon

Although colourless when chemically pure, zircon is typically yellow-brown to brown. It also comes in red, blue, purple, and green. Because of its high brilliance and dispersion, colourless zircon has sometimes been used as a substitute for diamond in jewellery.

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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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Cambodian Zircon Deposit
Summer 2009 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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Scattered Metallic Black Inclusions
Spring 2010 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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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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Spring 2003 G&G Lab Notes

This section, from the Spring 2003 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.

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Spring 1988 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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