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Cat's
Eye
Cat's-eye is a variety
of chrysoberyl, which has a distinct band of light across its
surface, which moves from side to side. Cat's-eye is named, for
the resemblance it has to the narrow iris in the eye of a cat.
Another name for the stone is "Cymophane", from Greek word, meaning
like a wave, because of the opalescent appearance of some crystals.
The colour ranges from a honey-brown to an apple green with rich
gold colours are generally the most valued. The most important
factor determining the value of stone is the strength and sharpness
of the eye.
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Left
: Cat's-eye double Cabochon
Right : Cat's-eye double Cabochon in dark brown
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The
eye in a chrysoberyl cat's-eye often has a shimmery blue tone.
Some cat's-eye also show a peculiar " milk and honey" effect.
In such stones, one side of the eye will be milky white and the
other will be gold, when a bright light is directed on to the
stone. Cat's-eye is used as a powerful talisman for good fortune.
Deposits of cat's-eye are in Sri Lanka and Brazil. Other deposits
are in China, India and Zimbabwe.
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Carnelian
Carnelian is flesh-red to brown-red in color and belongs to the Chalcedony group. It's coloring agent is iron and it's color can be enhanced by heating.
Its deposits are found in India, Uruguay and Brazil.
...Back
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Chrysoprase
Chrysoprase is considered the most valuable stone in the chalcedony group. It's coloring agent is nickel and it's colors can fade away in sunlight or when heated but they can recovered under moist storage. It was earlier used as a decorative stone and is used for ornamental objects.
Some of the places it can be found in are India, Tanzania, Australia, and United States.
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Chrysoprase-Matrix, Partly polished
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Chrysoprase
: 2 Stones with matrix
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