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Feature Article

Iridescence in Metamorphic

“Rainbow” Hematite

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June Birthstone

Pearl: The Beauty

of CaCO3

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Feature Article

Garden of

Glittering Gems

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featured

Research & News

5.01 ct pinkish orange CVD synthetic diamond
Lab Notes

Large Pinkish Orange CVD Synthetic Diamond

A combination of size, color, and clarity made this the most remarkable CVD synthetic diamond GIA has tested so far.
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Circular logo with the words “International GIA Gemological Symposium” around the outside and a star with a diamond center in the center circle.
Event

2018 GIA Symposium

Scientists and business leaders will gather at a summit of the gem and jewelry industry.
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GIA iD100 combines advanced spectroscopic technology with GIA’s 60 years of diamond and gemstone identification research to distinguish natural diamonds from synthetic (HPHT and CVD) diamonds and diamond simulants.
Seminar

Advanced Synthetic Diamond Seminar in Hong Kong, June 19

Learn the latest techniques to identify synthetic diamonds from GIA researchers. Seating is Limited.
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Recently submitted 3.52 ct. CVD-grown diamond.
Lab Notes

Five CVD Synthetic Diamonds Greater Than Three Carats

The GIA lab examines five gem-quality CVD-grown diamonds in sizes that reflect the improving technology of the synthetic gemstone industry.
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Micro-World

Pink Tourmaline in Spodumene

A large, rare inclusion is found in a spodumene host.
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Indonesian opal cabochons, 6.94 and 3.79 ct.
Gem News International

Opal from West Java, Indonesia

Description of Indonesian opal reportedly from West Java.
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Learn & Connect

Learn How To Buy

Engagement Rings

Start A Career

in Gems & Jewelry

Use our labs to

Verify a Stone

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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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