Gems & Gemology

Unique Raindrop Pattern of Turquoise from Hubei, China

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Gems & Gemology

Auctions of European Royal Jewelry, Including Marie Antoinette’s Jewels

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March Birthstone

Aquamarine: A Sea of Greens and Blues

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Research & News

Change of color observed in an alexandrite.
Lab Notes

Dramatic Color Zoning in Alexandrite

A gem cutter’s thoughtful design enhances the natural color zoning in an 8.55 ct alexandrite.
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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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Polished cube of rock crystal quartz.
Micro-world

Blue Inclusion in Rock Crystal Quartz

A beautiful blue inclusion is highlighted in rock crystal quartz cut to showcase it.
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Unusual violet color of a Maxixe beryl.
Gem News International

Unusual Violet Maxixe Beryl

A handsome fantasy-cut gem of an unusual violet hue is confirmed as maxixe beryl.
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Interesting fluorescence pattern of the sword-shaped diamond.
Lab Notes

Novelty Cut Diamond with Remarkable “Fire and Ice” Fluorescence

Dramatic color-fluorescing areas in a sword-shaped diamond give rise to the nickname “Fire and Ice.”
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An emerald from Swat Valley shows an interesting growth pattern with two colorless cores.
Gem News International

Trapiche-Type Emeralds from Pakistan

An emerald from the Swat Valley manifests its growth in three distinct steps, identifying it as “trapiche-type."
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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

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