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It has hardness of 8.5 Mohs. It is formed of beryllium aluminum oxide and its specific gravity is 3.68 - 3.78.
Like the eye of a panther, cat's-eye chrysoberyl seems almost supernatural in origin. How could something so feline be mineral and not animal? Cat's-eye chrysoberyl, a cousin of  color-changing alexandrite, is a variety of chrysoberyl, which has a distinct band of light across its face, which sweeps from side to side.
The color ranges from a honey-brown to an apple green with rich gold colors generally the most valued. The most important value factor is the strength and sharpness of the eye. Fine cat's-eye chrysoberyl often also shows the "milk and honey" effect. When a bright light source is directed at the side of the stone, one side of the eye will be milky white and the other remains gold. When the stone is rotated, the colors switch. Cat's-eyes are especially popular in men's jewelry.
Chrysoberyl can also seen in a faceted variety, which has a honey-gold color. It may remind you of yellow sapphire, topaz, or citrine.
The following varieties of gemstones come under it -
Chrysoberyl: transparent yellowish green to greenish yellow and pale brown
Alexandrite: red in incandescent light and green in daylight
Cats eye: usually yellowish or greenish
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