Brazilian Alexandrite Cat's Eye Round Cabochon

About Alexandrite Cat's Eye

Alexandrite cat’s eye is a rare variety of chrysoberyl, a beryllium-aluminium oxide. Its most remarkable feature is the combination of two optical effects: a moving, narrow band of light called chatoyancy, and a colour change that is usually green to bluish green in daylight and red, purplish red or raspberry in incandescent light. The cat’s-eye effect is caused by fine, parallel needle-like inclusions, commonly associated…