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. Below is a small series of China Jewelry Merchants Network to introduce you to the value factors and selection techniques of Opal Stone.
What are the value factors of opal gemstones?
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.
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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.
How to choose Opal
Brightness determines everything: If you must use a sentence to explain the problem, it is "the more vivid the color of Opal, the better the quality." The low-grade opal looks bleak and radiant.
Presenting more than 3 colors: The highest-grade opal must be in multiple colors, that is, 3 or more colors.
Indispensable high saturation: Saturation is the purity of the color. When an opal gem presents a color that is very bright, it is another superior sign.
Judging from the graphics: This is the unique judging feature of Opal, and the different color patterns also determine the value of Opal. Because the color change of the opal surface is represented by irregular angular spots or color points, the regular shape of the angular large spots is the best, and the beautiful patterns are called colorful, ribbon, straw, Husks, flags, etc., and some irregular patterns will symbolize some wonderful things or like a painting. The superior pattern is very clear, including flower sea, rotation, lightning and flame. The poor pattern is blurry, with only a few small colored spots, like moss and grass.
The big head is always dominant: no matter which kind of gem is bought, the carat weight is a key factor affecting the price. The thickness in the entire opal is related to the size and shape of the opal itself, which is an important factor to consider and calculate when measuring value.
Picking innocents: You don't want to see any gems, and all kinds of cockroaches will weaken the value of opal. Obvious cracks on the surface of Opal can seriously affect value. 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. 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 will only appear from one angle and will degrade the stone.
Must be a certificate: Since many opals in the market are flattened or mezzanine, in order not to spend money and future investment, buying a gem with a certificate has always been a thoughtful suggestion for everyone. It is an indispensable step for jewelers to present an authoritative gem identification certificate. This is not only to prove the need for value or resale of the insurance company, but also to clarify the responsibilities of both parties.
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