Back to gem encyclopedia

Diamond

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

Responsive image

Responsive image

See gem as
Polished
Rough

Tools

Photos & Videos

An example of a diamond grading report that has a branded cut name on the report.

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.

How to Use the GIA iD100™

GIA iD100™ Gem Testing Device

The oval blue topaz

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.

Two diamonds that both look the same. One is natural and one is synthetic.

Load More

All photos remain under the ©Gemological Institute of America copyright and may only be used with permission. More Copyright Information

This Month's

Featured Gems

reading

Peridot

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

reading

Fancy Color Diamond

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

reading

Diamond

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

reading

Emerald

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

reading

Citrine

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

View the Gem Encyclopedia