What is Alexandrite?


Alexandrite is a variety of chrysoberyl that displays a color change depending on the lighting conditions. It’s primarily found in Russia, Sri Lanka, and Brazil. Alexandrite is often used as a gemstone and is popular for its unique color-changing ability.

Alexandrite is a rare and unique gemstone that changes color depending on the lighting conditions. Its unique appearance makes it a popular choice for jewelry, especially rings and pendants.

Gemstone Properties

Chemical ClassificationInorganic - Oxide (Chrysoberyl)
ColorChanges from green in daylight to reddish-purple under incandescent light.
TransparencyTransparent to translucent.
OccurrenceRussia, Brazil, and Sri Lanka.
FormationFound in granitic pegmatites and mica schists.
Mohs Hardness8.5.
Specific GravityApproximately 3.73.
Diagnostic PropertiesColor change under different lighting.
Chemical CompositionBeAl3O12
PleochroismStrong; different colors can be observed when viewed from different angles.
Crystal SystemOrthorhombic (variety of Chrysoberyl)
Optical PropertiesBiaxial (+)
Refractive Index1.741 - 1.760
Birefringence0.008 - 0.010
2V angleMeasured: 85° to 90°