Cat's eye, that is, "with the cat's eye effect of chrysoberyl". It is a rare and valuable variety of jewelry variegated stone cat's eye, also known as Alexandrite cat's eye, that is, color change and cat's eye phenomenon. Cat's eye is one of the rarest and most valuable types of chrysoberyl, and is quite expensive.
[Introduction to Cymophanite]
Category: Mineral of the chrysoberyl group
Transparency: transparent to translucent
Luster: glassy to greasy
Refractive index: 1.746-1.755
Birefringence: 0.008-0.010
Dispersion: 0.015
Hardness: 8.5
Density: 3.71-3.75 g/cm3
Fracture: shell-shaped
[Origin]
Cat's eye stone is mainly produced in gas-forming hydrothermal deposits and pegmatite veins. The world's most famous cat's eye stone origin for the southwest of Sri Lanka's Tranabula and Gower and other places, Brazil and Russia and other countries also found cat's eye stone, but very rare.
[Color]
Cat's eye stone comes in a variety of colors, such as honey yellow, brownish yellow, wine yellow, brownish yellow, yellow-green, yellow-brown, gray-green, etc., of which honey yellow is the most valuable. Transparent to translucent. Glassy to greasy luster.
[Cat's Eye Effect]
Cat's eye stone is named after the cat's eye phenomenon, which is as flexible and bright as a cat's eye, and can change with the intensity of light. This optical effect is called the "cat's eye effect".
There are many types of gemstones with the cat's eye effect, and according to statistics, there may be as many as 30 types. In addition to quartz cat's eye and gold-green cat's eye, there are also "pyroxene cat's eye" and "aquamarine cat's eye", which are the most common ones on the market. Because of the gold-green cat's eye is the most famous and precious, customarily it is also referred to as "cat's eye", other cat's eye can not be so called.
[How to choose the chance of Cymophanite]
① color: the color of cat's eye has a variety of colors, with other shades of yellow-based, the best color for the honey yellow 60000 yuan.
② eye line: eye line requires straight, even, continuous and not break the line, clear and not muddy, bright and not gray;
③ weight: for gemstones, the greater the weight, its value is geometrically increased, for the cat's eye, is no exception, the market has been very little, and the diameter of more than 5cm is even more rare.
To sum up: it is important to consider the color, the position of the eye, the shape of the gemstone, the weight and other factors. For a quality cat's eye gemstone, the cat's eye line should be thin and narrow, with clear boundaries; the eye should be open and closed flexibly, revealing a living light; the cat's eye color should contrast with the background; and the cat's eye line should be located in the center of the curved surface.
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