ALEXANDRITE


All facts and figures taken from the GIA

alexandrite_cut

Green in sunlight. Red in lamplight. Color-changing alexandrite is nature’s magic trick. Often described by gem aficionados as “emerald by day, ruby by night,” alexandrite is the very rare color-change variety of the mineral chrysoberyl. Originally discovered in Russia’s Ural Mountains in the 1830s, it’s now found in Sri Lanka, East Africa, and Brazil, but fine material is exceptionally rare and valuable.


MINERAL: Chrysoberyl
CHEMISTRY: BeAl2O4
COLOR: Bluish green in daylight, purplish red in incandescent light
REFRACTIVE INDEX: 1.746 to 1.755
BIREFRINGENCE: 0.008 to 0.010
SPECIFIC GRAVITY: 3.73
MOHS HARDNESS: 8.5


Alexandrite is a birthstone for June, along with pearl and moonstone. Alexandrite is also the gem for the 55th wedding anniversary.

FOUND WHERE

Precious_Gemstone_Where_Found_Alexandrite