Cat’s Eye Chrysoberyl

Cat’s eye chrysoberyl, also known as cymophane, is cut en cabochon. It has a near-white line across a yellowish-grey stone, due to canal- or feather-like fluid inclusions, or needle-like inclusions of rutile. The most highly prized cat’s eye color is a light golden brown, often with a shadow that gives a light and dark, ‘milk and honey’ effect.

In trade, only cat’s eye chrysoberyl may simply be referred to as cat’s eye.

Pale yellow chrysoberyl, popular in 18th and 19th-century Portuguese jewelry, was also known as chrysolite.

Occurrence

Large waterworn pebbles of various colors are found in the gem gravels of Sri Lanka. Cat’s Eye chrysoberyl is found in China, Brazil, and Sri Lanka.

Cat’s Eye Chrysoberyl Properties

• Specific Gravity: 3.71
• Refractive Index: 1.74-1.75
• Birefringence (DR): 0.009
• Luster: Vitreous
• Crystal Structure: Orthorhombic
• Composition: Beryllium aluminum oxide
• Hardness: 8½

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