Alexandrite Gemstone | Natural Alexandrite Stone

Green in sunlight. Red in lamplight. Color-changing alexandrite is nature’s magic trick.

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This section, from the Fall 1988 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.

Pleochroic colors caused by cyclic twinning produce a kaleidoscope effect in alexandrite.

An octahedral fluorite crystal is observed in Brazilian alexandrite.

This section, from the Fall 1983 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.

This Month's

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.

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

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

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