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James E. Shigley
Article
James Shigley

GIA’s current distinguished research fellow has represented the Institute’s gemmological excellence around the world for the past four decades.

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Emerald and diamond brooch.
Article
Jewels of Hollywood: Accessories and Jewellery that Made the Stars Shine

“Jewels of Hollywood”, on loan from the Kazanjian Foundation, showcases some of the jewellery and accessories associated with Hollywood royalty.

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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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Two blue sapphires side by side
Article
G&G Announces Most Valuable Article Awards

G&G announces the winners of the Dr Edward J. Gübelin Most Valuable Article Awards for 2019.

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Gem materials and in front of rare books.
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Top 10 Digital Reads from the GIA Library

Explore GIA’s collection of free, rare digital books and manuscripts that document the history of gems and jewellery.

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Zircon
Article
Zircon History and Lore

Many people have heard of zircon but never seen it. This is mostly because of colourless zircon’s wide use as a diamond simulant in the early 1900s.

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Turquoise
Article
Turquoise History and Lore

Turquoise is one of the world’s most ancient gems. Archaeological excavations revealed that the rulers of ancient Egypt adorned themselves with turquoise jewellery, and Chinese artisans were carving it more than 3,000 years ago.

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Tourmaline
Article
Tourmaline History and Lore

Somewhere in Brazil in the 1500s, a Spanish conquistador washed the dirt from a green tourmaline crystal and confused the vibrant gem with emerald. His confusion lived on until scientists recognised tourmaline as a distinct mineral species in the 1800s.

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97.45-carat Imperial Topaz
Article
Topaz History and Lore

Most authorities agree that the name topaz comes from Topazios, the old Greek name for a small island in the Red Sea, now called Zabargad. (The island never produced topaz, but it was once a source of peridot, which was confused with topaz before the development of modern mineralogy.)

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Tanzanite
Article
Tanzanite History and Lore

Tanzanite is relatively new to the coloured stone galaxy. Almost overnight, tanzanite became popular with leading jewellery designers and other gem professionals, as well as with customers who had an eye for beautiful and unusual gems.

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