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Gemological Institute Of America | All About Gemstones - GIA





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 * Gem Encyclopedia
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 * Education
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      * Back
      * All Programs & Courses
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        * Back
        * Applied Jewelry Professional Program
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        * Graduate Pearls Program
        * Comprehensive CAD/CAM For Jewelry Certificate
        * Graduate Jeweler Program
        * Jewelry Design Certificate
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Previous


GEMOLOGY & JEWELRY DESIGN

Unearth Your Career Potential with a GIA Education

Apply Today


GIA ID100®

GIA iD100 Gem Testing Device: Full Disclosure at Your Fingertips

Learn More


GEMS & GEMOLOGY

Burmese Peridot from Mogok

READ MORE


MARCH BIRTHSTONE

Aquamarine: A Fairy Tale of a Gem

LEARN MORE


GIA EDUCATION

Apply for a GIA Scholarship

Learn More


LABORATORY SERVICE

GIA Diamond Origin: A Program That Makes a Difference

Learn More


GEMOLOGY & JEWELRY DESIGN

Unearth Your Career Potential with a GIA Education

Apply Today


GIA ID100®

GIA iD100 Gem Testing Device: Full Disclosure at Your Fingertips

Learn More


GEMS & GEMOLOGY

Burmese Peridot from Mogok

READ MORE


MARCH BIRTHSTONE

Aquamarine: A Fairy Tale of a Gem

LEARN MORE


GIA EDUCATION

Apply for a GIA Scholarship

Learn More


LABORATORY SERVICE

GIA Diamond Origin: A Program That Makes a Difference

Learn More


GEMOLOGY & JEWELRY DESIGN

Unearth Your Career Potential with a GIA Education

Apply Today


GIA ID100®

GIA iD100 Gem Testing Device: Full Disclosure at Your Fingertips

Learn More
Next
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 * 4
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featured


RESEARCH & NEWS

Previous
Micro-World

Chondrodite in Red Spinel from Mogok, Myanmar





The Bangkok lab recently encountered a single round crystal of chondrodite in
red spinel, a possible indicator of Burmese origin.
Read More



Lab Notes

Two Antique Mughal Spectacles with Gemstone Lenses





Unique diamond and emerald-lensed spectacles from the Mughal Empire were tested
in GIA’s New York laboratory.
Read More



Colored Stones Unearthed

Colored Stones from the Deep





The first installment of this column discusses the formation of colored stones
from the crust-mantle transition and below.
Read More



Micro-World

Radioactive Green Diamond





The Carlsbad lab recently encountered a 2.42 ct green diamond showing signs of
radiation treatment by the use of radioactive salts.
Read More



Gem News International

Blue Zircon Reportedly from Malawi





A reported new source of blue zircon in Malawi yields rough material for
beautiful finished stones in the gem trade.
Read More



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.
Learn More



Micro-World

Chondrodite in Red Spinel from Mogok, Myanmar





The Bangkok lab recently encountered a single round crystal of chondrodite in
red spinel, a possible indicator of Burmese origin.
Read More



Lab Notes

Two Antique Mughal Spectacles with Gemstone Lenses





Unique diamond and emerald-lensed spectacles from the Mughal Empire were tested
in GIA’s New York laboratory.
Read More



Colored Stones Unearthed

Colored Stones from the Deep





The first installment of this column discusses the formation of colored stones
from the crust-mantle transition and below.
Read More



Micro-World

Radioactive Green Diamond





The Carlsbad lab recently encountered a 2.42 ct green diamond showing signs of
radiation treatment by the use of radioactive salts.
Read More



Gem News International

Blue Zircon Reportedly from Malawi





A reported new source of blue zircon in Malawi yields rough material for
beautiful finished stones in the gem trade.
Read More



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.
Learn More



Micro-World

Chondrodite in Red Spinel from Mogok, Myanmar





The Bangkok lab recently encountered a single round crystal of chondrodite in
red spinel, a possible indicator of Burmese origin.
Read More



Lab Notes

Two Antique Mughal Spectacles with Gemstone Lenses





Unique diamond and emerald-lensed spectacles from the Mughal Empire were tested
in GIA’s New York laboratory.
Read More



Colored Stones Unearthed

Colored Stones from the Deep





The first installment of this column discusses the formation of colored stones
from the crust-mantle transition and below.
Read More



Micro-World

Radioactive Green Diamond





The Carlsbad lab recently encountered a 2.42 ct green diamond showing signs of
radiation treatment by the use of radioactive salts.
Read More



Next
 * 1
 * 2
 * 3
 * 4
 * 5
 * 6

--------------------------------------------------------------------------------


LEARN & CONNECT

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Engagement Rings

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Diamond Origin

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Verify a Stone

Download

Gems & Gemology

This Month's


FEATURED GEMS

PERIDOT



Found in lava, meteorites, and deep in the earth’s mantle, yellow-green peridot
is the extreme gem.



FANCY COLOR DIAMOND



Dazzling brilliance. Captivating color. These are the planet’s most valued gems.



DIAMOND



Diamonds are among nature’s most precious and beautiful creations.



EMERALD



Emerald is the bluish green to green variety of beryl, a mineral species that
includes aquamarine.



CITRINE



Citrine is the transparent, pale yellow to brownish orange variety of quartz.



View the Gem Encyclopedia


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