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Chrysoberyl is a mineral, and also a gemstone variety, known for its transparent to translucent, yellowish-green or brownish-yellow color. It's a durable gemstone with a hardness of 8.5 on the Mohs scale, making it suitable for jewelry. Chrysoberyl can exhibit chatoyancy, a "cat's eye" effect, and some varieties, like alexandrite, display color-changing properties.

Key Features of Chrysoberyl:

• Color: Usually yellowish-green or brownish-yellow, but can also be colorless, green, white, or brown.

• Transparency: Transparent to translucent.

• Chatoyancy: Some chrysoberyl exhibits chatoyancy, a "cat's eye" effect, with a distinct silvery line across the dome.

• Color Change: Alexandrite, a variety of chrysoberyl, changes color under different lighting conditions, shifting from green in daylight to red under incandescent light.

• Hardness: A hardness of 8.5 on the Mohs scale, making it durable.

• Crystal System: Orthorhombic.

• Chemical Composition: BeAl2O4.

Varieties of Chrysoberyl:

• Ordinary Chrysoberyl: Yellowish-green, transparent to translucent.

• Cat's Eye Chrysoberyl (Cymophane):Exhibits chatoyancy, a "cat's eye" effect.

• Alexandrite: A color-changing variety of chrysoberyl.