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Abstracts; Spring 1994

This article, from the Spring 1994 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.

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Rough Emerald
Article
Emerald Description

Emerald is the green to greenish blue variety of beryl, a mineral species that also includes aquamarine as well as beryls in other colours.

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Ruby
Article
Ruby Description

Ruby is the most valuable variety of the corundum mineral species, which also includes sapphire.

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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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