Many people may know that the gemstone of the opal is very beautiful and is worn on the body, which is particularly important for identification. However, many friends may not know that the opal is also graded. So how is the opal grade? The following is a small series of China Jewelry Merchants Network to introduce the classification of the opal.
Cat eye grading is based on weight, color, clarity, cut and eyeliner. According to industry consensus and routine practice, cat eyes can be divided into five levels: special, first, second, third and other cat eyes. The special cat's eye is a rare cat's eye, and its quality is higher than that of the first-class cat's eye. Super cat eyes can be divided into special grade, special grade 2 and special grade 3. In addition to the excellent characteristics of the first-class cat's eye, the special cat's eye is superior to the eyeliner. The special level has both gold and silver eyeliner, special grade 2 is golden eyeliner, special grade 3 is silver eyeliner, and special cat eye has rare blue light.
1, super cat eyes
The special cat's eye is a rare cat's eye, and its quality is higher than that of the first-class cat's eye. Super cat eyes can be divided into special grade, special grade 2 and special grade 3. In addition to the excellent characteristics of the first-class cat's eye, the special cat's eye is superior to the eyeliner. The special level has both gold and silver eyeliner, special grade 2 is golden eyeliner, special grade 3 is silver eyeliner, and special cat eye has rare blue light.
2, the level of cat eyes
The cat's eye has a uniform texture and its own color is light. The inner body is invisible to the naked eye and has a darkroom effect. In natural light, the eyeliner is concentrated, thin, sharp and strong, and two to three eyeliners open and close freely when moving horizontally. The color is generally sunflower yellow, apple green (yellow-green), honey yellow, dark green, texture, and can contain a very small amount of impurities, but no cracks, translucent to transparent.
3, two cat eyes
The cat's eye quality requirement is: the eyeliner may not be very clear under natural light, but it should be clear and bright under strong sunlight. There is no need to open two or three lines when moving, and other conditions are in line with the first quality.
4, three-level cat eyes
Cat eyes tend to have more cracks, but the condition of the eyeliner and the color are the same as those of the second level.
5, four cat eyes
How is the level of opal? The four-stage opal eyeliner is often scattered, the texture is often uneven and the color is gray, and the clear and bright cat's eye is rarely seen under concentrated glare.
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