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GIA's Gübelin Gem Project: Corundum

Ruby and sapphire (usually blue, but also in every other colour) have been the most important coloured gemstones for several thousand years. Originating historically in south-east and central Asia, and more recently in eastern Africa, these coloured varieties of the mineral corundum have been much sought as gems because of their rarity, colour and durability. Gem corundum can display asterism and chatoyancy due to the presence of oriented mineral inclusions, and in some cases, a change of colour when viewed under different light sources.

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Article
Emerald Journey

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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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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Article
GIA Gem Project
Beryl

Chemically pure beryl is colourless, but trace elements give rise to green, blue and pink/red colours.

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Article
Landmark Articles from
Gems & gemmology

For eight decades, Gems & Gemology, GIA’s peer-reviewed quarterly journal, has educated generations of readers and protected the gem-buying public. We share ten landmark articles that were particularly significant to gem and jewellery professionals.

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Article
80 Years of Gems & Gemology

Over these eight decades, G&G has been a critical resource for the gem and jewellery industry. Groundbreaking articles on diamond grading appeared as early as the 1940s. Through the Lab Notes section, GIA gemmologists reported on the latest treatments and synthetics, which helped to protect the trade and the public.

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Gemstone Durability: Design to Display

A treatise on the design, display, care and repair of fine gemstones.

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Opticon treatment
Fracture Filling of Emeralds Opticon and Traditional "Oils"

The filling of surface-reaching breaks in emeralds is a relatively common practice, for which various kinds of oils and a natural resin have historically been used.

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Abstracts; Summer 1991

From the Summer 1991 issue of Gems & Gemmology, a summary of important gemmology-related articles published in other journals.

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Rough Emerald
Article
Seeing Green: All About Emeralds

Want to see into the future? Be an eloquent speaker? Defeat spells and enchantments? Such is the lore of the emerald.

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