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Melee: Building Blocks of Contemporary Design

Learn about the versatility of melee in jewelry design and how to design and engineer long-lasting jewelry using GIA Quality Assurance Benchmarks.

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Colombian independent miners
Colombian Emerald Industry: Winds of Change

A firsthand look at Colombia’s emerald mines and the cutting and trading industry in Bogotá.

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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 gemology, 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 made at the 2017 JCK Las Vegas show.

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Opal from the Shewa Province, Ethiopia

Opal occurs as nodules in volcanic rocks at a new gem opal locality in the Menz Gishe district of Shewa Province, Ethiopia.

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Montana sapphires after two rounds of heating
Big Sky Country Sapphire: Visiting Montana’s Alluvial Deposits

Documents a visit to the upper Missouri River and Rock Creek sapphire mining areas.

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Two variscite cabochons from central Tajikistan
Variscite from Central Tajikistan: Preliminary Results

A look at the gemological properties and chemical composition of this light blue to light green to green gem material, which is suitable for cabochon cutting.

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Particolor tourmaline crystal from Luc Yen, Vietnam
An Update on Tourmaline from Luc Yen, Vietnam

Reviews the characteristics of tourmaline from pegmatites in the Luc Yen district of northern Vietnam.

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Article
GIA Gem Project
Beryl

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

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Garnet
Article
GIA Gem Project
Garnet

Often thought of as a deep red gemstone, garnet can also be yellow, orange, green or brown – any color except blue.

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Ruby crystal from Montepuez
Article
Series of Articles on Rubies from Mozambique

GIA publications since 2009 on ruby mining in Mozambique

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