Powder crystal Brazil powder crystal is mostly opaque, with many inclusions, which can be seen at a glance and easily distinguished.

"Artificial powder crystal" should imitate "African ice seed powder crystal", and the two colors are almost the same, but notice that the former is as transparent and flawless, and the corner flash is particularly bright, while the latter still has some inclusions more or less, or the cloud shape and crystal surface extrusion can still be distinguished. "Best powder crystal" is a marketing statement of department store counters, but it is actually artificial powder crystal.

In Chinese mainland, another effective way to dye amethyst hand beads is to dye "natural white crystal" purple. In this way, people can still see what is inside, thinking that it is natural amethyst, but it is actually dyed. This kind of dyeing has a strange hue, but it is easy to be fooled by inexperienced people or in places with poor light. This amethyst will fade after a while. Under normal circumstances, this is the least forged gem because of the filamentous inclusion. However, counterfeit products do appear on the market. Note that there are tubular straight holes in the crystal, but there are no rutile or tourmaline in it, only holes. Be careful, this is a fake hair crystal.

Yellow crystal balls on the market are often filled with "golden calcite", the transparency of which is only superficial. Arsenic W is bright yellow, not as transparent, pure yellow or brownish as natural topaz. Topaz will not react when dropping dilute hydrochloric acid, and calcite will bubble and release carbon dioxide, because it is a component of calcium carbonate.

Green phantom crystal is a glass interlayer, which can be seen in vegetable markets and roadside stalls in many places. The price is cheap, of course, but it's easy to tell if you look closely. There are no distinct natural phantoms, volcanic ash and green layers. I don't know what that is. It feels different. I suggest you don't hand it in.

The red phantom crystal (red hair crystal), which is also made by using the technology of glass interlayer, has also captured flea markets and roadside stalls of the size of Taiwan Province Province. The red substance inside makes you look strange, as if it is the feeling of liquid, not volcanic ash, not a hair; At the same time, pay attention to the feeling of holding it in your hand, just like touching glass, it will feel wet, greasy and sticky; Look inside, there are bubbles! This is proof of glass, not crystal. If you feel different, don't pay. It's not too late to buy after the identification is correct.

There are generally the following kinds of fake crystals on the market: 1. Glass products. Melted crystal 3. Lead glass. Synthetic crystals. Regenerated crystal (crystal cultivation), among which crystal cultivation is the most confusing, because it is as difficult to distinguish from rock crystal in density, hardness and feel, and often appears as extremely transparent amethyst and topaz ornaments, but it is also the best to distinguish. Most of the products cultivated by crystal are listed in relatively large blocks, with large-size hand beads and bracelets, uniform colors and no stone cracks. However, natural amethyst, especially topaz, is very rare to have a large and pure material with almost no flaws. The truly uniform natural amethyst topaz is generally polished into small diamond-shaped gem particles, and the slightly larger natural amethyst or topaz ornaments are more or less cotton. At present, the place that produces the most recycled crystals (that is, crystal growth) is Japan, and they use a method called hydrothermal method to produce crystal growth. The basic principle of this method is to inject a large amount of "anhydrous silicic acid" into a blast furnace barrel about two stories high, add silicon dioxide, and then add a high temperature of about 400 degrees Celsius to the upper layer of the bottom layer. The temperature of the upper layer is slightly lower than that of the lower layer by about 40 degrees, and the crystal nucleus attached to the crystallized regenerated crystal is suspended in the molten liquid (it looks like a meter ruler of about 20 centimeters and is very thin, so it can be used in the future. Based on the principle of thermal convection, the high-temperature supersaturated raw material melt flows from the bottom to the upper layer with lower temperature, and the crystal slowly adheres to both sides of the crystal nucleus (imagine the crystallization process of sugar or salt), and finally forms a thick flaky crystal with the crystal nucleus in the middle. After about two or three days, when the crystal is crystallized to a certain thickness, the crystal growth is taken out, cooled and shaped, and then the crystal nucleus in the middle is sawed off, leaving the crystal growth, which is crystal clear and uniform in color; Therefore, according to this principle, in the whole operation process, the temperature, pressure and environment are strictly monitored and cannot be easily changed, otherwise the whole step cannot be completed, so the color of the whole crystal culture must be equally uniform. For topaz, the color of natural topaz is light and deep, with clouds or ice cracks, which human beings can't imitate so far, so they can also be distinguished. It is particularly worth mentioning that the common crystal bracelets in the mainland market are red, yellow, blue, green and purple, which are flawless. These can be said to be imitations of crystals, and their value is not high. However, unscrupulous merchants have argued that what is crystal stone. In fact, friends who know a little about crystal should know that there is no such large transparent rock crystal raw material to make bracelets, and even if there is, the cost is high. It is absolutely impossible to own a few hundred yuan or even dozens of yuan, but some crystal bracelets with stone patterns and inclusions (hair crystals and magic crystals) are real, but the price is also high (generally thousands or tens of thousands are better); In addition, crystal (timely crystal in a narrow sense) has no red, green and blue colors. WAWA looked up a lot of data to know that this is determined by the molecular structure characteristics of the crystal. Specifically, it is very long, so there is no way to discuss it in detail here. Anyway, everyone knows that if you see these three colors of crystals, they must not be rock crystals, and they should not be "newly discovered mineral deposits". Scary words like "extremely rare" were cheated. You know, in a word, rock crystals (timely crystals in a narrow sense) are not red, green and blue. WAWA knows that a red crystal called "Cherry Crystal" (also called "Watermelon Red") has appeared in the crystal market. Obviously, this is artificial. The blue-green olivine, blue crystal aquamarine, red crystal ruby and garnet, which are most easily misunderstood by people, are also called "crystals" in a broad sense, but they have nothing to do with real gem crystals. As long as you know them, you can make the right decision when you choose. Although the proportion of crystals in gems is not high, there are still color grades. There are many factors that affect the price of crystal, unlike diamonds, which can be judged by 4C. Therefore, I suggest that you listen more, watch more and compare more to really judge. The standard in the general market is that the larger the crystal, the better the transparency, the finer the color and the better the shape (such as hexagonal columnar crystal or crystal cave ore). ), but there are some special ones, such as the original powder crystal ore is by no means a hexagonal column, and the so-called powder crystal hexagonal columns on the market are all artificially ground). WAWA personally thinks that when buying crystals, it is most important to like them, that is, the so-called eye margin, plus some. At present, some crystal ornaments in China are copied by unscrupulous merchants with cheap glass, and sometimes retailers themselves can't judge the authenticity of the wholesaler's goods, so it is necessary to mention some main differences between crystals and glass imitations: the thermal conductivity of crystals is greater than that of glass, and the true (natural) and false (glass imitations) crystals in the same temperature environment have a cool feeling when held in their hands, which is why people often say "true". Of course, this method requires players who have accumulated experience for a long time to have such a subtle feeling; And we also need to know that the real crystal is definitely not never hot. It's just that the thermal conductivity is high, so it will feel cold. It will feel very hot if it is demagnetized under the high temperature lamp of jewelry store or in the sun for a long time. At this time, you should not wronged the real crystal. Hardness specific gravity: the Mohs hardness of glass is 4~5, and the Mohs hardness of rock crystal is 7~7.5 (10 for diamond), so the "crystal" to be identified can be scratched on the glass, and whether there are traces can be used as one of the judgment criteria; Glass has a small specific gravity, while crystal has a large specific gravity. Two true and false crystals of the same size are weighed by hand. The crystal looks textured and the glass is light, not to mention acrylic (plexiglass). Optical characteristics: the glass is isotropic, with a refractive index of about 1.4, completely extinction, and black opacity under the polarizer (note: optical glass is transparent under polarization, but has no extinction phenomenon); The crystal is anisotropic, and its refractive index is 1.544~ 1.553, which has obvious light and dark changes under the polarizer. However, in recent years, with the penetration of high-tech synthesis technology, the fidelity of counterfeit products has increased. Slowly, many merchants no longer use low-grade glass to imitate crystals, but artificially cultivated crystals have all the characteristics of rock crystals, so these can not be the eternal truth to distinguish the authenticity of rock crystals, but can only be used as the basis to distinguish crystals from glass, and also let everyone know some common sense and avoid being fooled more. There are also some ways to help distinguish real crystal from fake crystal: birefringence method: using the birefringence of crystal, put a black line or hair on white paper, press the crystal on the line, and observe the black line or hair through the crystal. If it is refracted into two lines, it is crystal stone. If it is not refracted, it is still a line shadow, so it may not be a crystal stone. This method can distinguish between crystal ball and glass imitation ball, but both crystal and crystal growth have birefringence, and even in crystal, if the crystal is too small or the angle is wrong, the birefringence effect is difficult to appear, so this is not the only way to distinguish; Magnetic field test method: Hold two rock crystal pieces with the fingers of thumb, forefinger and middle finger, and the distance between them is about 1-2 cm. They slowly rotated relative to each other and approached each other. You can immediately feel a wonderful force similar to the attraction and repulsion of magnets, especially crystal balls, which are not available in rock crystals, including synthetic crystals. Self-perception method: when you are shopping on a special day and feel happy and quiet, you will choose an inductive crystal on impulse (WAWA's personal experience is that you will see it at first sight, even if you spend a lot of time looking at other crystals, you will still choose it in the end, which works every time. That's because the vibration frequency of some crystals is close to that of some people, which will naturally summon their own masters, so trust your intuition! _) As for choosing crystals that are not easy to imitate (such as hair crystal, green ghost, amethyst, with inclusions, natural ice cracks, clouds, and color band changes), or choosing slightly defective crystals in the case of uncertainty, it is also a relatively safe way; Choose reputable businesses, there will be more choices, and the quality and service will be more guaranteed. But usually, the bigger the store, the more beautiful it is, which means the higher the cost and the more expensive the price will be! By the way, Swarovski is an expert in manufacturing international brand artificial crystals with a long history. He is mainly famous for his exquisite crystal cutting and grinding technology and beautiful design, but only the real Swarovski has collection value, but now WAWA finds that many places are only artificial crystals (some are not even called crystals, but they are Swarovski's, and the price is very low, which is an insult to the brand. You know, real Swarovski crystal products are all marked with swan, and you can find the materials for work in their official website, and the price is even more expensive. Don't be fooled casually. _ Finally, when you want to choose crystal, you can also find friends who really know more about crystal (such as WAWA, Hee Hee). In short, when choosing crystal, you should see more and contact more, know more common sense and accumulate your own taste and appreciation ability. Let's cheer together!