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Corundum
Chemical Composition Aluminum oxide
Colour EAlmost all colours. Medium to dark coloured red stones are known as ruby; and other colours, sapphire.
Refractive Index R.I. 1.76-1.77.
Durability Hardness 8.5
Crystal Structure Orthorhombic
Specific Gravity 3.68-3.80
Sources / Occurrence Brazil, Siberia, India, Zimbabwe, Sri Lanka, and Myanmar (Burma).
Varieties

Alexandrite, Cat’s Eye Chrysoberyl and ordinary transparent Chrysoberyl.

Chrysoberyl cat’s eye or cymophane in Greek means, “waving light”. The stone gets its name owing to its effect. Fine parallel inclusions produce a silver-white line, which appears as a moving light ray in a cabochon-cut stone. It is similar to the pupil of a cat.

It is considered a spiritual stone and is good for promoting psychic and spiritual perception. Cat's-eye is a good stimulant and helps curing mental disorders. Thus being a gemstone of seers and astrologers in India, where it is highly valued, it is believed to bring the wearer material wealth.