Gems & Gemology

Characteristics of Emeralds from Swat Valley, Pakistan

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: Photo: Xiaoyan Yu

Gems & Gemology

Natural-Color D-to-Z Diamonds: A Crystal-Clear Perspective

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February Birthstone

Amethyst: A Cathedral of Splendor

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: Courtesy of The Crystal Caves Museum in Atherton
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Research & News

Star peridot with magnetite inclusions.
Lab Notes

Magnetite Inclusions in Star Peridot

Magnetite inclusions in a four-rayed star peridot help to date its terrestrial age.
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Knowledge Session Webinars
Webinar Series

GIA Knowledge Sessions

Engage in webinars on the most diverse and pressing issues in gemology today, including gemstone origin, laboratory-grown stones and new discoveries in field gemology.
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Tree-like metal sulfide inclusion in quartz.
Micro-world

Tree in Rock Crystal Quartz

An unusual find of orangy red staurolite crystals appear with more expected inclusions in a ruby from Mozambique.
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Half colorless and half brown rutilated quartz sphere.
Gem News International

A New Type of Rutilated Quartz Composite Product

Demand for rutilated quartz spheres in Taiwan gives rise to a new type of composite material.
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Spodumene with a rare light blue color.
Lab Notes

Blue Spodumene

Raman analysis helps to confirm the identification of a rare and lovely large blue spodumene.
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Red oil used to clarity enhance gemstones like ruby and spinel.
Gem News International

Oiled Spinel

Testing of a Mogok spinel demonstrates that oil can have a significant impact on clarity.
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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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