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Nature of Material: cat's-eye is the chatoyant variety of the mineral species chrysoberyl (KRIS-oh-bare-ul); orthorhombic crystal system; chemical composition BeAl2O4 

Appearance: Semitransparent to semi translucent yellow to yellowish green, greyish green, brown to brownish yellow

Phenomena: chatoyancy, may also show col¬or change (see Alexandrite); extremely rare cases of 4-ray asterism instead of chatoyancy
Variety and Trade Names
Cat’s-eye Alexandrite - very rare variety with both color change and chatoyancy Cymophane (SIGH-oh-fane) - chrysoberyl showing a broad sheen rather than a sharp eye, or rough material that could probably be cut to show an eye; was also used interchangeably with cat's-eye; the term has fallen into disuse.

Misnomers: none known
Typical Size Range: usually ½ to 2 ct; stones up to 170 ct known
Typical Cutting Style: cabochon
Optic Character: DR, biaxial positive
Refractive Index: 1.746-1.755 (+.004-.006)
Birefringence: .008 to .010
Pleochroism: like non-chatoyant varieties of similar color (see Chrysoberyl and Alexandrite); strength affected by transparency
Birthstone Designation
Thursday, Friday (alexandrite or cat's-eye); 18th wedding anniversary

Major Sources: Sri Lanka, Brazil, USSR
The Meaning Of Chrysoberyl

CHRYSOBERYL- the stone of luxury & for mental disorders

This is considered a stone with a spiritual emphasis. It "is good for promoting psychic and spiritual perception. Cat's-eye is a good nerving stimulant and is helpful for mental disorders. It is the gemstone of seers and astrologers."(1) In India, where it is highly valued, it is believed to bring the wearer material wealth as well as preventing its loss.
The suggested minimum weight for these gemstones is 2 carats. 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.
Cat's-eye Chrysoberyl has the presence of a familiar, a powerful talisman that can direct fortune. Put it to work for you! Chrysoberyl can also seen in a faceted variety, which has a honey-gold color. It may remind you of yellow sapphire, topaz, or citrine.

Since ancient times, chrysoberyl has been regarded as a gemstone which protects its wearer and keeps disaster at bay. The cat's eye most of all is seen as a particularly effective protective stone and talisman. On account of its golden tones, chrysoberyl is often also associated with wealth – and this idea is certainly not without foundation, since in its most beautiful form as a high-quality cat's eye it is up among the gemstones of the
Discipline and self-control are the qualities mainly associated with chrysoberyl in modern gemstone therapy. Chrysoberyl are said to promote concentration and the ability to learn, and to enable the wearer to think clearly and far-sighted. Thanks to the secret power of the chrysoberyl, negative thoughts are said to be transformed into positive energy. And these positive qualities are said to be even more marked with a chrysoberyl cat's eye. However, chrysoberyl is also regarded as a gemstone which promotes tolerance and harmony, and it is one of the lucky stones for those born under the sign of Leo.
Chrysoberyl is said to assist one in striving for excellence, and to bring peace of mind and increased self-confidence by helping one to more fully understand the fact that one already has all that one needs to succeed within oneself.


Ultravoilet Fluorescence
Inert; Cat's-Eye alexandrite - inert to moderate red (LW and SW) Absorption Spectra: same as transparent varieties of similar color
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