Four tricks teach you how to distinguish between true and false jadeite. The first trick is to look at the color: natural jadeite is natural in color, unevenly distributed, with a prolonged green trend and generally no fluorescence. The second trick is to look at the polished surface: the polished surface of natural jadeite is fine and smooth, showing a strong glass luster with grease. If you look closely at the polished surface, you can usually see the mottled crystal interwoven structure. In general, the variegated crystal particles of the same jadeite are uniform in size; At the same time, slightly transparent to opaque white fibrous crystals can be seen, commonly known as "stone flowers". The third trick is to listen to the sound: tap the natural jade gently to make a crisp and pleasant sound, and if it is artificially processed, it will make a dull and dumb sound. The fourth measure: because of the high density of jadeite, it feels like a thug when it is weighed by hand; Jade has a strong water-holding ability. When it drops on it, the water drops protrude higher. At the same time, experts remind consumers that when buying high-priced jewelry and jade, they should choose regular and well-known jewelry stores or large and reputable shopping malls. Also remember to ask the merchant for the jewelry and jade appraisal certificate with "CMA" and "CAL" marks. Usually, every precious jewelry and jade has a certificate to ensure that the purchased jewelry and jade are consistent with the certificate, and the certificate is accompanied by photos. Identification method of agate Agate is a kind of gem, which is often used for setting jewelry and carving handicrafts. The identification method of authenticity is as follows: (1) Color: the color of real agate is bright and bright, and the color of fake agate is poor, and the contrast between them is obvious. Natural red agate has distinct colors and obvious stripes. If you look closely, you can see tiny red dots densely arranged on the red belt. The fake agate hookah made of stone mostly has petal-shaped patterns at the bottom, forming a "chrysanthemum bottom"; The dyed blue agate is bright and even, giving people a false feeling. (2) Texture: Most fake agates are stone imitations, which are softer than real agates. Jade can mark fake agate, but real agate can't. There are few defects on the surface of real agate, and there are more inferior ones. (3) Process quality: The production process of high-quality agate is strict and advanced, so the surface brightness is good, the inlay is firm and geometric, and there are no scratches and cracks. (4) Grade: water bile agate is the most precious variety of agate, which is characterized by closed inner cavity and containing water. Red, blue, purple and pink are the best agates in all grades. They should be transparent, free from impurities, sand cores and cracks. Among them, the block weight above 4.5 kg is super grade, the block weight above 1.5 kg is first grade, and the block weight above 0.5- 1.5 kg is second grade. Agate stone has natural color and is dyed after post-processing. Natural colors are mainly red, amber and white. Among them red is the best. The blue-purple agate jewelry sold in the market is not true, but dyed after processing, and will fade after several years of use. The dyed agate is mostly natural variegated, which is not easy to be directly processed into jewelry. How to identify true and false agate ornaments? It can be identified from three aspects. (1) Transparency: The transparency of real agate is not as good as that of synthetic agate, which is a little messy, and some can see natural waterlines or "clouds", while synthetic agate is as transparent as glass balls. ⑵ Weight: Real agate jewelry is heavier than synthetic agate jewelry. ⑶ Temperature: Real agate is warm in winter and cool in summer, while artificial agate changes with the outside temperature, which becomes hot in hot days and cool in cold days. How to choose agate ornaments? First of all, choose according to your favorite color. Red agate jewelry is the most expensive. If you choose an agate necklace, you should pay attention to the consistency of each bead color, no noise, the bead size should be appropriate and the smoothness should be good. Then, lift the necklace to see if it is vertical and if each bead is hung on a line. If the necklace is bent, it means that some beads are biased and the processing technology is rough. Similarities and differences between crystal and agate: The chemical composition of crystal and agate is silica, but there are still some differences between them. Crystal is a single crystal, crystal is usually a crystal, and agate is a polycrystalline aggregate. Under the electron microscope, agate is composed of countless tiny silicon dioxide crystals, so agate is usually translucent, while crystal is transparent. Many times, the two will be reborn, forming a crystal cave sold by crystal shops. People generally judge the quality and economic value of agate by naked eye identification. Although modern technology is developed and there are many jade identification instruments, it is very inconvenient to use these instruments in the transaction process. Secondly, it can't solve the problem. The reason is very simple, and it will be limited by the environment. If we judge the quality and economic value of agate, the instrument will be useless. It is impossible to carry out complex instrument operation at the trading site, so naked eye identification is always an extremely important method. There are many kinds of agates, known as "1000 kinds of agates and 10000 kinds of jade", so there are many identification methods. Usually, the grading standards are stripes, colors, transparency, cracks, impurities, sand cores and block weight. Except water bile agate, which is the most precious, it is generally best to match harmonious and pretty raw materials. Generally speaking, the quality appraisal and economic value evaluation of agate can be divided into the following categories: 1, super: beautiful stripes; Pure and bright red, blue, purple and pink; Good transparency, that is, translucent; No cracks, sand cores and impurities; The weight of wood blocks is about 5 kg or more. 2, level 1: beautiful stripes; Pure and bright red, blue, purple and pink; Good transparency, that is, translucent; No cracks, sand cores and impurities; This block weighs about 2-5 kilograms. Grade 3 and 2: beautiful stripes; Pure and bright red, blue, purple and pink; Good transparency, that is, translucent; No cracks, sand cores and impurities; The weight of the block is about 0.5-2 kg. 4, level 3: beautiful stripes; Pure and bright red, blue, purple and pink; Good transparency, that is, translucent; No cracks, sand cores and impurities; The weight of the block is about 0.5 kg or less. The above aspects are the methods to identify the quality of real agate. In addition, there are a lot of fake agates on the market at present. The main products are synthetic agate, such as glass, plastic and stone. Although its texture and color are comparable to those of natural agate, it has no economic value. The seller wants to confuse fish with pearls, and the experts will sneer at it after reading it. Therefore, when lovers want to collect or appreciate it, they should carefully distinguish it. The main identification methods are: 1, pattern and color: real agate is bright in color, while fake agate is poor in color and light, and the contrast between them is obvious. Natural agate has distinct colors and obvious stripe patterns, while imitation fake agate is mostly bright and uniform, giving people a sense of authenticity. 2, texture: fake agate is mostly stone imitation, softer than real agate. Emerald can be used to draw traces on fake agate, but it really can't be drawn. There are few defects on the surface of real agate, and there are more inferior ones. 3. Transparency: The transparency of real agate is not as good as that of synthetic agate, which is a little messy. Some can see natural waterlines or "clouds", while synthetic agate has good transparency and is as transparent as a glass ball. 4. Weight: Real agate jewelry is heavier than synthetic agate jewelry. 5, temperature: real agate is warm in winter and cool in summer, while synthetic agate changes with the external temperature, it becomes hot when it is hot, and it becomes cold when it is cold. Identification of true and false jadeite 1 luster: true jadeite has a warm luster, whether translucent or opaque, it is normal to have a small amount of impurities or cotton-wool patterns inside; Fake jade articles are dry and dull, and some have bubbles. ② Hardness measurement: Carve and scrape with a knife, leaving no trace of real jade. (3) The proportion of jade: real jade feels heavy, while fake jade floats lightly. (4) Listening: hanging jade with a thread and knocking with a hard object, the authentic sound is crisp and pleasant, and the aftertaste is melodious; The fake one is dull and dry. ⑤ Look at the fracture surface: With a magnifying glass of 10 times, the fracture surface of real jade is uneven, and a fine structure can be seen; Fake jade articles have neat and shiny fractures, often glass imitations, while those with rough fracture structure and waxy luster are stone imitations. References:

/ShowArticle.asp？ ArticleID=5240 How to Identify the True and False Jade Culture (ZT) is a profound and special culture in China, which runs through various historical periods in China. About 500 Chinese characters come from the word "jade". Many people add the word "jade" to the description of beautiful things, such as jade girl, jade hand, jade capacity, jade photo, jade body, etc ... Even if they make sacrifices for justice, they are described as "jade broken". Jade has a wide meaning. Generally speaking, beautiful stones that are naturally generated and processed into delicate, smooth, bright-colored, tough and chemically stable can all be classified as jade. What people usually say about jade is actually nephrite and jadeite. Nephrite refers to jade composed of tremolite-actinolite minerals, namely white jade, jadeite, jasper and topaz. Jadeite refers to jadeite similar to nephrite, which is native to Myanmar. Diamonds, rubies, agates, corals, coal crystals and tortoise shells are all "organic gems". People's requirements for soft and hard jade are the same, that is, the ones with hard and dense texture and bright and beautiful color are better. China Neolithic jade, the earliest data can be found in the Xianrendong site in Haicheng, Liaoning, about1.2000 years ago. This is a snake-shaped stone tool. Later, with the invention of grinding technology, people finally found regularly that there are still a number of materials in the stone that are particularly delicate and beautiful after grinding. Although people don't know it is jade yet, it has been deliberately selected for human body decoration. People who play jade for the first time are most afraid of encountering fakes because they don't understand jade. At present, the identification of glass imitation jade products on the market is probably the most common and simple one among fakes. Common ones are bare small rings, chicken hearts and jade pieces called "emeralds". Because this kind of glass product is made by casting mold, the high-temperature glass liquid will overflow a little at the edge of the object when it is combined, and it will become a vaguely convex mold line after cooling. Touch it with your hand, and your eyes will find something. If you look at the light with a magnifying glass, there must be large and small bubbles inside. If you don't invite experts, novices can identify the authenticity of jade by themselves from three aspects: First, because glass is very brittle and hard, the structure is clearly arranged, and it lacks the compactness and toughness of jade, and it can't stand strong high-speed rotary carving, so it is generally impossible to process high relief and round carving on glass. Second, use a magnifying glass to find bubbles, even if you can only see one, you can confirm that it is not jade. Thirdly, chromium oxide is added into the glass, and the color is close to ruby; Adding cobalt oxide, the color is close to sapphire; Adding chromium oxide and copper oxide, the color is close to emerald ... and so on, there are many kinds of fake jade. However, their colors are always relatively thin, lacking the oily and rich feeling of natural jade color. The identification of new jade and old jade is different. The identification of new jade focuses on the authenticity of the variety, the quality of the texture and the fineness of the sculptor. The identification of old jade is relatively complicated. In addition to several basic requirements, new jade also needs to identify its production and historical value. Textual research on the historical value of jade is based on a clear era. To be familiar with the common shapes, characteristics, crafts and colors of jades in different times, we can often consult books and materials on jades, which will subtly improve the dating level of jades. Contact with real objects as much as possible can correct the parallax between pictures and real objects in books. How to identify real jade At present, some booths selling Baoyu in the market are often mixed with some exquisite artificial jade. The more reliable identification methods are: seeing, listening and testing. Look, mainly depends on the crystal transparency, real jade has strong transparency and oily luster; Listen, Zhen Yu's voice is crisp, but her voice is dull; In the test, the real jade scratched the glass, but the jade itself was intact. Common fake jade includes plastic, stained glass, marble, electrochromic fake jade made of jade powder and crystal with salt water, imitation jade containing nitrate, etc. And their identification methods are different. Plastic is lighter than jade, and its hardness is poor, so it is generally easy to identify. It's easy to distinguish between painting and getting off work. As long as you take it under the light or check it in the sun, you will see many bubbles in the glass. It is difficult to distinguish fake jade by electric color. Its purpose is to electroplate inferior jade and then coat it with a beautiful emerald appearance, so it is easy to mistake it for real jade. At this time, you need to observe carefully. If there are some small cracks with blue in the green, it is fake jade. Because electroplating will leave cracks, experts call it "spider claws". It is also said that if the electro-colored fake jade is put in hot oil, the electroplating color will fade and return to its original color. Synthetic jade made of jade powder, crystal and salt water is an imitation dark old pit jade. The identification method is simple, that is, their specific gravity is different. The specific gravity of natural jade is 3.3-3.4, while that of synthetic jade is only 2.8. Weigh by hand, or use a balance to distinguish between true and false. Jade imitated with nitrate looks whiter and smoother than jade. The ancients said, "Jade is better than salt, so it must be high." That is, white jade should be as advanced as nitrate. It can be seen that nitrate and jade are difficult to distinguish. However, the facts are different after all. As far as color is concerned, white jade is often blue, and white is rare, while nitrate is pure white. As far as jade is concerned, jade is moist and delicate, as fat as cream. Nitrate is wet, but there are thieves in it. White jade is a natural product, and it is difficult to have a unified structure, including jade ribs and jade flowers. If nitrates are manufactured artificially, there is no such appearance. White jade has a solid texture and no bubbles can be found. No matter how well nitrate is treated, bubbles and pores are often exposed. If you know these items, you won't regard nitrate products as jade articles.