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Aquamarine: From the Sides of Forbidding Cliffs

March Birthstone

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Discover Career Opportunities in Gems and Jewelry

March 13 at the Javits Center

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Heat Treatment of Burmese Ruby, Copper-Diffused Red Feldspar, and Porcelain-Treated Turquoise

New Gems & Gemology Issue

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featured

Research & News

Examples include unheated brown specimens, heated rough material, and faceted stones.
Gem News International

Blue Zircon Reportedly from Malawi

A reported new source of blue zircon in Malawi yields rough material for beautiful finished stones in the gem trade.
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Knowledge Session Webinars
Webinar Series

GIA Knowledge Sessions

Engage in webinars on the most diverse and pressing issues in gemmology today, including gemstone origin, laboratory-grown stones and new discoveries in field gemmology.
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Small trigons and a rough surface texture seen on a chondrodite crystal.
Micro-World

Chondrodite in Red Spinel from Mogok, Myanmar

The Bangkok lab recently encountered a single round crystal of chondrodite in red spinel, a possible indicator of Burmese origin.
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Diamond (left) and emerald (right) lenses.
Lab Notes

Two Antique Mughal Spectacles with Gemstone Lenses

Unique diamond and emerald-lensed spectacles from the Mughal Empire were tested in GIA’s New York laboratory.
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“Healing Sisters” rings featuring amethyst and peridot.
Colored Stones Unearthed

Colored Stones from the Deep

The first installment of this column discusses the formation of colored stones from the crust-mantle transition and below.
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A 2.42 ct green diamond treated by radioactive salts.
Micro-World

Radioactive Green Diamond

The Carlsbad lab recently encountered a 2.42 ct green diamond showing signs of radiation treatment by the use of radioactive salts.
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Gems & Gemmology
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 Colour Diamond
Fancy Colour Diamond

Dazzling brilliance. Captivating colour. 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 Encyclopaedia