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Diamonds are among nature’s most precious and beautiful creations.
Colorless diamonds are scarce—most diamonds have tints of yellow or brown.
Factors used to describe diamonds: Clarity, Color, Cut, Carat Weight
The rarity of one or more of the 4Cs can affect value.
The crystal shape of a gem diamond is often the octahedron.
Trigons—little triangular depressions—occur only on octahedral faces.
Diamond’s growth marks help experts separate diamonds from simulants.
How to Use the GIA iD100™
GIA iD100™ Gem Testing Device
Found in lava, meteorites, and deep in the earth’s mantle, yellow-green peridot is the extreme gem.
Dazzling brilliance. Captivating color. These are the planet’s most valued gems.
Emerald is the bluish green to green variety of beryl, a mineral species that includes aquamarine.
Citrine is the transparent, pale yellow to brownish orange variety of quartz.
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