New Gems & Gemology Issue

Tourmaline, Sapphire, Cultured Pearl, and More…

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: Courtesy of Omi Privé

Value Factor Series

Colored Stone Darkness & Brightness

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Feature Article

Montana Yogo Sapphires’
Unique Gemology

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featured

Research & News

A 283.74 ct rough tsavorite (left) yielded this 11.674 ct square cushion-cut gem (right).
Gem News International

Largest Square Cushion-Cut Tsavorite

A 283.74 ct rough tsavorite from Merelani, Tanzania, yields a square cushion-cut gemstone weighing 116.76 ct.
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Polished free-form opal encapsulating an insect.
Micro-World

Fossil Insect in Opal

Precious opal hosts a trapped insect.
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Discussion panel on country of origin
Gem News International

Second World Emerald Symposium

Important topics such as sustainability, blockchain, nanotechnology, and traceability were discussed at the second World Emerald Symposium held in Bogotá.
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Rough diamond, yellow in color
Feature

Diamond Research Gives Clues to the Formation of the Continents

Mineral inclusions trapped in diamonds reveal the continents’ construction – and helps GIA researchers date diamonds.
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A large group of people pose for a photo in front of a dinosaur skeleton.
Alumni Association

Alumni Opportunities to Grow Your Career

Take advantage of GIA Alumni Association benefits and programs to meet fellow alumni, get discounts on GIA education and connect with industry leaders.
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Sapphire shows a strong color change from grayish violet to purple-pink.
Lab Notes

Low-Fe, High-V Color-Change Burmese Sapphire

The Carlsbad lab identifies a color-change Burmese sapphire with a unique chemistry profile.
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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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