New Gems & Gemology Issue

Pink Sapphires from Madagascar, Antique Rose-Cut Colored Stones, and Blue Amber Origin

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April Birthstone

Diamond: A Colorful Twist to the April Birthstone

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: Courtesy of Sothebys

Gems & Gemology

Vietnam: Shell Nuclei, Pearl Hatcheries, and Pearl Farming

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Research & News

Bands of particles and short iridescent needles.
Micro-world

Inclusions in Kenyan Rubies from the John Saul Mine

Very similar inclusion scenes featuring needles and thin films make rubies from Kenya hard to distinguish from Mogok rubies.
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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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Press Release

Study of Rare Diamonds Unlocks More of Earth's Secrets

Scientists at GIA continue to delve deep into earth's geologic history, using diamonds' distinctive characteristics to go – virtually – where no scientist has ever gone.
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Zircon crystals and rutile needles (left) and dendritic inclusions (right) in sapphire.
Micro-world

Unknown Dendritic Inclusions in Sapphire

Dendritic inclusions in a pinkish-purple sapphire are revealed with fiber-optic lighting.
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<i>Pinctada Margaritifera</i> bead cultured pearls, cut in half (left) and intact (right).
Gem News International

A Near-Field-Communication (NFC) Technology Device Embedded in Bead Cultured Pearls

A Tahitian pearl becomes wearable technology with the insertion of a micro device.
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Face-up view of a green-yellow round brilliant diamond.
Lab Notes

Blue “Graining” in Green-Yellow Diamond

Unusual color zoning likely indicates multiple treatments of a Fancy Intense green-yellow diamond.
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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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