Opal, also known as the Oriental Cat's Eye, Ceylon Cat's Eye, is a rare and precious variety in jewelry. Because the opal shows the optical phenomenon, like the cat's eyes, it is flexible and bright, and can change with the intensity of light, hence the name. The reason why cat's eye can produce cat's eye effect is mainly because there are a large number of small, dense and parallel filamentous or tubular inclusions inside the gold emerald. After the orientation cutting, the reflected light is concentrated into a light band to form a cat's eye phenomenon.
Cat's eye trait
Opal has a variety of colors, such as honey yellow, brown yellow, wine yellow, brown yellow, yellow green, yellow brown, gray green, etc., among which honey yellow is the most expensive. Common opals are transparent to translucent, glass or grease luster, with a refractive index of 1.746-1.755 and a birefringence of 0.008-0.010. It has obvious dichroism, dispersion of 0.015, and is heterogeneous. Mohs hardness of 8-8.5, relative density of 3.71-3.75, often with a shell-like fracture.
How to choose your favorite gem
The quality of cat's eye gemstones is mainly determined by factors such as color, eyeliner and weight.
Color: There are many colors of cat's eyes, mainly yellow with other colors. The best color is honey yellow, and the others are yellow green, brown green, brown yellow and brown.
Eyeliner: The eyeliner is required to be straight, uniform, sharp and continuous, continuous, clear and not turbid, bright and not dark.
Weight: For gemstones, the value increases geometrically with increasing weight, which is no exception for cat eyes. Large cat eyes are rarely available on the market, while diameters larger than 5 cm are less common.
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