Gems & Gemology

A Decade of Ruby from Mozambique

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September Birthstone

Sapphire: An Ancient Token of Wisdom and Truth

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Feature Article

A Tropical Paradise of Ocean-Inspired Jewelry and Gemstones

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featured

Research & News

Stones identified as kornerupine (left), prismatine (center), and undetermined (right) based on their chemistry.
Lab Notes

Separation of Kornerupine and Prismatine

GIA’s laboratories are now using LA-ICP-MS to separate kornerupine from prismatine based on boron concentrations.
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Polished freeform opal with a three-phase fluid inclusion.
Micro-World

Mexican Opal with Large Fluid Inclusion

A common opal with a large eye-visible fluid inclusion is a first for the San Simon mine in Jalisco, Mexico.
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Jadeite from Levoketchpel (back row) and Polar Urals (front row).
Gem News International

Ornamental Jadeites from the Polar Urals of Russia

Gemological and trace element chemical characteristics of ornamental jadeites from the Levoketchpel deposit in Russia are compared with other sources.
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Diamonds From the Deep

Kimberlites: Earth’s Diamond Delivery System

Examines the basic characteristics of kimberlites and their relationship with diamonds.
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Curved banding seen in flame-fusion synthetic sapphire under short-wave UV light.
Micro-World

Curved Banding in Flame-Fusion Synthetic Sapphires

The appearance of curved banding under short-wave UV easily identifies flame-fusion synthetic sapphire.
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Before (left) and after (right) heat treatment.
Gem News International

Low-Temperature Heat Treatment on Pink Sapphire

Twelve pink sapphires undergo low-temperature heat treatment and reveal a correlation with the 3232 cm-1 FTIR peak.
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Gems & Gemology
This Month's

Featured Gems

Featured Gem Peridot
Peridot

Found in lava, meteorites, and deep in the earth’s mantle, yellow-green peridot is the extreme gem.
Fancy Color Diamond
Fancy Color Diamond

Dazzling brilliance. Captivating color. These are the planet’s most valued gems.
Diamond
Diamond

Diamonds are among nature’s most precious and beautiful creations.
Emerald Bluish Green Stone
Emerald

Emerald is the bluish green to green variety of beryl, a mineral species that includes aquamarine.
Featured Gem Citrine
Citrine

Citrine is the transparent, pale yellow to brownish orange variety of quartz.

View the Gem Encyclopedia

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