GIA iD100®

GIA iD100 Gem Testing Device: Full Disclosure at Your Fingertips

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June Birthstone

Pearl: Treasure from Earth’s Seas and Streams

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Gems & Gemology

Mineral Inclusions in Sapphire from Southern Vietnam: Indicator of Formation

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Research & News

Snowflake-like pattern seen in a partially healed fissure.
Micro-world

Snowflake Inclusions in Mong Hsu Ruby

A holiday snowflake scene in a treated Mong Hsu ruby surprises and delights a gemologist in the Bangkok lab.
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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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Blue flux-grown synthetic sapphire.
Lab Notes

Unusual Absorption in a Blue Flux-Grown Synthetic Sapphire

The Bangkok lab identified unexpected characteristics in a flux-grown synthetic sapphire.
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Irregularly shaped cavities in emerald.
Micro-world

Unmasking Emerald Filler

A long-wave ultraviolet flashlight illuminates chalky blue fluorescence in a fracture-filled emerald.
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Purplish pink Montana sapphire in this study (left) next to a hexagonal rough (right).
Lab Notes

Rare Intense Purplish Pink Montana Sapphire

A Montana sapphire of unusual size and color proves to be from the secondary deposit of Rock Creek.
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Black inclusions in Davdar emerald identified as magnetite.
Gem News International

Update on Inclusions in Emeralds from Davdar, China

Testing reveals interesting inclusions in Chinese emeralds to be calcite and dolomite.
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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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