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Pearl
Article
Pearl Description

Perhaps the best-loved gems of all time, pearls—both natural and cultured pearls—occur in a wide variety of colours. Learn about the factors that make pearls so popular and desirable!

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Article
Ammolite: The Fashionable Fossil

Ammolite: The Fashionable Fossil

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A small house, left, and a treehouse, right, are lit up against a star-filled sky.
Article
GIA’s Knowledge Sessions: A New Way to Share Gemmological Information

Webinars are an easy, informal way for GIA experts to share information and stay connected with the community of researchers and gem and jewellery lovers.

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CVD, HPHT and Natural Diamonds
Article
Is There a Difference Between Natural and Laboratory-Grown Diamonds?

Learn about the differences – and similarities – between natural and laboratory-grown diamonds, and how GIA’s researchers and grading laboratories can tell the difference

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Husband and wife gaze happily at emerald rough found in a Colombian mine.
Article
Colombian Emerald Industry: Winds of Change

Andy Lucas, GIA’s education manager of field gemmology, researches and documents the mine to market journey of gemstones. Lucas shares the changes he observed in Colombia’s major emerald mining and cutting areas in a presentation he gave at the 2017 JCK Las Vegas show.

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Ren Lu GG
Article
Infrared Microscopy Applications

Explores the usefulness of this technique in the mapping of defects and spectral features, the determination of colour origin, and the identification of synthetic and treated diamond melee.

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Madagascar’s Zahamena National Park
Article
GIA Field Gemmologist Documents Madagascar Ruby Rush

Join GIA’s recent field expedition to the ruby rush in Madagascar’s Zahamena National Park.

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Parisite inclusion in emerald.
Inclusions in Natural, Synthetic and Treated Emerald

Provides a visual guide to the internal features of natural, synthetic and treated emeralds.

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Exploring Zambia’s Emerald Mines
Article
GIA Field Gemmologists Visit Zambia’s Emerald Mines

Go onsite to Zambia’s emerald mines with GIA’s field gemmology team.

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Discover Mozambique’s Montepuez Ruby Mine
Article
Discover Mozambique’s Montepuez Ruby Mine with GIA’s Field Gemmologists

See inside the world’s most productive ruby mining operation with GIA’s field gemmology team.

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