characteristic
Common colors: various body colors can appear. White body colors can be called albumin, black, dark gray, blue, green and brown body colors can be called black protein, and orange, orange red and red body colors can be called fire protein.
Gloss: glass to resin luster
Opal value
Opal's price measurement standard
It depends on many factors, such as hue, brightness, pattern style, color layer thickness, defect status and color-changing game, which all play an important role in the evaluation of opal. Opals are usually priced in carats. Other important factors include cutting, grinding, size and shape.
1, embryo color
The color of embryo is one of the most important factors to measure the value of opal. The hue of embryo refers to the overall hue and color of opal, ranging from black to milky white. Usually? Opals with black or dark embryonic tones are more valuable than light or milky opals. Black Opal is mainly produced in Leiden Ningrich, New South Wales, Australia. It is the most precious opal, and the usual market price is per carat? 15000 Australian dollars (about RMB? 100000 yuan). Shi Shuo opal usually has a deep embryonic hue. The embryo of white opal is lighter in color and lower in value. In addition to the above analysis principles, the value of crystal opal should be based on its transparency. Some crystal opals are called "black crystal opals" because of their dark color and high cost.
Step 2 be smart
Brightness is mainly the brightness and clarity of the color presented by opal. When viewing opal from the front, the brightness range of color can be divided into bright, bright, weak or dim.
3. Mode
The color fragments of opal form patterns, each pattern is unique, and different color patterns also determine the value of opal. Wonderful patterns are called colorful, forging? Ribbon, straw, chaff, China calligraphy and so on, and some irregular patterns will symbolize some beautiful things or like a painting, so we will give it a nice name. Excellent patterns will be very clear, including flowers, spins, lightning and flames. Poor patterns are blurred, like moss and grass.
4, color block
The thickness of opal in the whole opal is related to the size and shape of opal itself. Shi Shuo opal is only wrapped in a thin layer of opal due to geological formation, which is an important factor to be considered and calculated when measuring its value.
5. Change the color
Opal has different colors and brightness because of the structure of silicon ball arrangement, which depends on the diffraction of white light. Red opal is usually more valuable than green opal, but what about green opal? Color is more valuable than blue. Red opal is not often produced in nature, but it is rich in green and blue opal. The red color in opal is produced by the relatively large arrangement of silicon particles in the internal microstructure of opal, while the blue color is produced by the relatively small arrangement of silicon particles.
All the above factors are important factors to measure the value of opal. But experience is always irreplaceable. The fact is that there is no very standard method to calculate opal in the world? Value. Each opal has unique characteristics, such as pattern, brightness and color. If you care about the value of Opal, you should always ask for the authoritative certification of Opal and consult some experienced friends. It is worth mentioning that most opal seen in the market is split stone, with a layer of black rubber or black agate at the bottom and a layer of glass or crystal at the top, of which opal is only a very thin piece. The evaluation should be fully considered, should it? The institute wants the quality certificate of the National Jewelry Association.
Buy common sense
1, black opal
The royal price of opals is usually stable because of their shape and scarcity. Black opal is also the best opal in the world. The highest price on the market, the general price can be comparable to diamonds.
2. Gravel opal
As the sister gems of Black Opal, they are little known, but they have the same beautiful colors. Because silicon dioxide is wrapped very thin by iron ore, the whole opal contains? The weight of many iron ores, so the price of gravel opal per carat is also cheaper than that of black opal. Smart businessmen sell gravel opals in carats, leaving as much iron ore as possible on the back of opals to increase their weight. Because it is based on iron ore, Shi Shuo opal is harder than other opals.
3. White opal
Embryo color like milk is common, which usually makes the color contrast of opal not obvious, but I have also seen white opal with very bright color.
4. Crystalline opal
All kinds of opals above crystal opals have translucent or transparent embryonic tones. If the crystal opal is beautiful in color, it is very expensive, such as "crystal black opal".
If you check an opal, first make sure it is dry, and then carefully look at whether there are cracks on the surface of the opal under the light. Don't confuse the difference between cracks on the opal surface and natural lines. Cracked gems are almost worthless. If there is any crack in the opal itself, the seller who sold it to you should have the responsibility to let you know.
Maintenance of the original opal The original opal is a delicate gem, and its hardness is equivalent to that of glass, so it is very important to treat your original opal carefully to avoid damage. If what you want to deal with may damage your opal, you should take off your opal jewelry first (for example, you are going to work in the garden, move furniture, etc.) Well, from the above description, you should have a certain understanding of the price of opal. If you are interested in gems, please pay more attention to our Tuba rabbit!
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