The value of Opal depends on a number of factors: embryo body tone, brightness, pattern design, color layer thickness, flaws, and color-changing games, all of which play an important role in the valuation of Opal. Opal usually calculates the price in units of "carats". Other important factors include cutting, sanding, size and shape. 1, embryo body tone Embryo tonality is one of the most important factors in measuring Opal's value. The body tone is the overall tone and color of the entire opal, ranging from black to milky white. Opal, which usually has a black or dark body tone, is more valuable than light or creamy white. Black Opal is mostly produced in Leighton Nyinqi, New South Wales, Australia. It is the most precious opal. The usual market price is about 15,000 Australian dollars per carat (about 100,000 yuan). Sparkling opal often has a deeper body tone. The white opal has a light body color and a low value. In addition to the above analytical principles, the value of crystal opal is based on its transparency. Some crystal opal are called "black crystal opal" because of the deep and expensive color of the embryo. 2, brightness Brightness is primarily the brightness and clarity of the colors presented by Opal. When opal is observed from the front, the range of brightness of the color is divided into bright, bright, soft or dim. 3, the pattern Opal's color segments are composed of patterns, each of which is unique, and different color patterns also determine the value of opal. The beautiful patterns are called colorful, forged belts, straws, chaff, Chinese calligraphy, etc., and some irregular patterns will symbolize some wonderful things or like a painting, we will make it a good one. name. The superior pattern will be very clear, including the sea of ​​flowers, rotation, lightning and flame. Poor patterns are more blurred, like moss and grass. 4, color block The thickness of the opal in the entire opal is related to the size and shape of the opal itself. Sparkling opal is only a very thin layer of opal due to geological formation, which is important to consider and calculate when measuring value. factor. 5, the color appears Opal has a different color and brightness due to the diffraction of white light due to the structure of the silicon spheres contained therein. Red opal is usually more valuable than green opal, and green is more valuable than blue. Nature does not often produce red opal, which is rich in green and blue opal. The red color in the opal results from a relatively large arrangement of silicon grains in the inner microstructure of the opal, whereas the blue color is produced in a relatively small arrangement of silicon particles. 6, ç‘•ç–µ A variety of cockroaches will weaken the value of opal. There are almost no signs of obvious cracks on the surface of Opal. There are many fine cracks on the surface of the opal that will become worthless. Blisters or other mineral impurities are sometimes found under or inside colored opals, as well as in background linings. Other defects such as inferior opal lines, gray lines and air bubbles. The color and pattern of high quality opal should be continuous and vary from angle to angle. When opal does not produce a changing surface, the color appears only from one angle or the base material such as iron ore appears on the surface through the gemstone and the stone is devalued. 7. Conclusion All of the above factors are important factors in measuring the value of Opal. But experience is always irreplaceable. The truth is that there is no very standard way to calculate the value of opal in the world. Each opal has unique patterns, brightness and color. If you care about the value of opal, you should always ask for an authoritative certification of Opal and ask some experienced friends. Cotton Twill For Coat,High Density Twill Fabric,Cotton Dobby Spandex Fabric,Cotton With High Density Shaoxing Sinofashion Textiles Co.,Ltd. , https://www.shownaturetex.com
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