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Short-wave UV exposure’s effect on zircon colour
Tenebrescent Zircon

Colour modification is observed in a reddish orange zircon at the Bangkok laboratory.

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Chameleon diamond before and after heating
Chameleon Diamond with Nickel Absorption Band

A rare chameleon diamond is examined in GIA's Carlsbad lab.

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Zig-zag growth in synthetic ruby
Flux-Grown Synthetic Ruby with Hydrothermal Synthetic Seed Crystal

An unusual synthetic ruby, combining a hydrothermal ruby seed and flux ruby overgrowth, is examined at the Carlsbad lab.

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Fancy yellow 0.40 ct type Ib CVD-grown synthetic diamond
Yellow CVD Synthetic Diamond

A Fancy yellow type Ib CVD-grown synthetic diamond undergoes testing at the New York lab.

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Faceted wurtzite
Rare Faceted Wurtzite

A stone submitted for identification is revealed to be the first wurtzite examined by the GIA lab.

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Confusing, Triangular Inclusions in an Art Deco-Style Pin
Spring 1991 G&G Lab Notes

This section, from the Spring 1991 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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IMG - GIA Innovator Manson 10799 300x169
Article
D. Vincent Manson (1936–1999)

A gemmologist, educator, and self-described dreamer who established the Institute’s research department and founded the world-renowned International Gemmological Symposium.

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GIA Innovator Fryer 38839 300x169
Article
Charles "Chuck" Fryer (1928–2003)

World-renowned gem identification expert who guided GIA's lab services to the forefront of gemmological research.

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GIA Innovator
Article
Robert Shipley Jr. (1912–1982)

The son of GIA's founder, Robert Shipley Jr. made significant breakthroughs in gem instrumentation.

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GIA Innovator
Article
Richard T. Liddicoat (1918–2002)

A look at the "Father of Modern Gemmology", GIA's Richard T. Liddicoat

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