" Opa OPAL "
OPAL is derived from OPALUS in Latin, meaning "a collection of gems."
Ancient Roman natural scientist Pliny once said: "On an opal stone, you can see the ruby ​​flame, amethyst-like stains, emerald green sea, colorful, seamless, beautiful." Its color Like the night sky of Scandinavia, full of fantasy and mystery.
Ancient legend:
Opal was known as a Roman Empire and was of great value. According to Pliny, the Nunnery of the Senate has a very beautiful opal. He is very fond of it. At that time, the ruler Anthony asked him to give it, otherwise he would be exiled. As a result, Nonining chose to go exile and refused to offer Opal to Anthony. The charm of Opal is evident.
Color changing game:
Opal can appear in a variety of body colors: white body color can be called albumin; black, dark gray, blue, green, brown body color can be called black protein; orange, orange red, red body color can be called fire protein. The surface color of Opal changes with the intensity of light and the transformation of the visual angle, just like the game of playing hide-and-seek in various colors. English is called PLAY-OF-COLOUR. It is a phrase created specifically to describe the changing colors of Opal.
A good opal stone produces a flame-like appearance. This appearance has only been found in very few substances, but it has not been found in other gemstones, and it has attracted people's interest and intoxication in ancient times. This phenomenon of flame-like appearance caused by diffraction of light is called color change. This is the most important identifying feature of opal stone and its main attraction as a gemstone.
Identification of natural opal
Opal is a silica-based gemstone that is loved and known for its magical color-changing effects. The opal sold in the market is filled with a lot of synthetic opal, flat opal and artificially optimized opal, which are not part of the natural opal, its aesthetics, durability and value are already certain The extent is not as natural.
Natural opal has a natural color-changing effect, and the color film is in the shape of a two-pointed spine, and has obvious water absorption.
The synthetic opal jade natural opal has different structures, and the color piece has a hexagonal honeycomb or snake-like structure inside, and the color piece has a triangular shape. In addition, synthetic opal does not fluoresce under long-wave UV radiation.
Flattening Opal can also be called combination opal. It is a combination of several opal slices of different quality. Generally, the better quality opal layer is placed on the outer layer. The opal gloss of this kind of opal will change and the glued surface will be changed. There are bubbles inside.
We usually divide natural opals into two categories: “Pressius Opal†and “Ordinary Opalâ€. The beautiful color of Plysius Opal is a rare color game that is rare and precious. The color of the dim, can not present color-changing games called ordinary opal, ordinary opal found in the world and a small amount of production.
95% of the opals mined in the Opal mining area are ordinary opals, usually only white, gray or black. They are only suitable as background linings for "Deborah Opal" and "Cui Bolai Opal". The remaining 5% is some color grade opal, but 95% of them are just ordinary grades. In other words, only about 0.25% of the mining volume can be called a truly valuable opal.
Water-based opal pays attention to maintenance
Opal is a water-containing gem, technically called "containing 3%? 30% crystal water", although in the daily wearing process, the water in the opal will not escape, but the long-term high temperature or low humidity The moisture in the environment is still easy to lose, which means that it will gradually lose its crystal water when it is exposed to the air over time, resulting in cracks or flaws, weakening or complete loss of color, and bursting when the situation is serious. .
Fraud
In general, there are four main methods for the treatment of Opal fraud:
1. Flattening: Flattening is the most common method for processing opal. This is because the opal is formed in the deposit, the thickness is relatively thin, and it cannot be carved. Therefore, it is glued to the chalcedony or the inferior opal. Together, use quartz or glass to reinforce it.
2, injection molding: some opal quality is not good, the surface is porous. In order to improve the quality, injection molding in the hole, cover the cracks, make it color change and enhance the level. The opal transparency after this treatment is high, and the hot needle is used to burn, and there is a plastic smell.
3. Oiling: As with injection molding, in order to cover the pores and cracks and cracks of the inferior opal surface, then waxing and polishing to enhance the gloss. After this opal hot needle is burned, oil or wax will flow out.
4, smoked and sugar water carbonization: smoke is to change some of the opal stains that are not obvious color change, enhance the color change effect. The operation is very simple, as long as the opal paper is hugged, and then wrapped with foil and heated, the effect can be achieved. But this opal only has a blackened surface and there is no change inside. If the sugar water is carbonized, the opal is firstly soaked in sugar water, and then taken out to dry and immersed in concentrated sulfuric acid, so that the sugar can be carbonized to achieve the dyeing effect.
In addition to these four methods, of course, there are other methods, which are not detailed here. You don't have to worry about it after watching it. Compared to natural opal, this kind of opal can still be discerned.
How to choose a perfect opal
Unlike other gemstones, Opal is unique in that it is not as transparent as a general gem and has no specific color or flame, but in an opal you can see colorful colors, which is exactly what it is, how to Choose a perfect opal gemstone jewelry.
1 must be transparent:
If you must use a sentence to explain the problem, it is "the brighter the opal, the better the quality." The low-end opal looks like Wu Wu’s lack of brilliance.
2 multicolor is the most important:
The highest-grade opal must be in multiple colors, that is, three or more colors.
3 focus on color purity:
Saturation is also the purity of the color. When an opal gem appears, each color is very bright and saturated, which is another superior sign.
4 judge the merits 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 of the opal surface is represented by irregular angular spots or color points, the mottled angular large spots are the best, and the beautiful patterns are called colorful, ribbon, straw, and chaff. Etc. There are also some irregular patterns that 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 greater the number of 5 carats, the more valuable:
Regardless of which gemstone you buy, the carat weight is a key factor influencing 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.
6 multi-faceted viewing quality:
Since the value of opal is completely determined by color, the more uniform the color, the higher the value. Therefore, when purchasing opal, pay attention to observe the overall effect of gemstone coloring, and rotate 360 ​​degrees. The quality opal has uniformity in the whole body. Brightness, saturation and color, there is no "blind zone".
7 purchase insurance products:
Opal is a very soft gemstone that is suitable for egg noodle processing or for carvings. If you happen to buy a pendant and want to punch, it is a very risky move. Because any heating device can cause water evaporation in the opal, the direct result is that your opal not only cracks but also loses the most valuable color change effect, turning into a small stone stronger than ordinary stone. In summary, it is recommended to buy Opal finished jewelry, or opal semi-finished products that are easy to process.
8 pure less ç‘•ç–µ:
You are not willing to see any gems, and all kinds 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. 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.
9 certificate verification status:
Jewelry purchases must require a jeweler to present an authoritative gem identification certificate. People who know Opal may rarely be able to move for its beauty. The colorful colors and delicate texture are its fascinating capital. There are many varieties of opal, such as cat's eye opal, wood opal, honey opal, Crystal opal, etc., but not all opal have a very high collection value, the following will introduce the most rare and expensive varieties of the Opal family.
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