As we all know, jadeite is polycrystalline, that is, many small crystals gather together, so there will be gaps between particles. Iron and manganese are abundant in nature, and rainwater or groundwater reacts with them to produce brown, brown, yellow, red and other colors of iron oxide and manganese oxide. These substances will slowly enter the jade particles with the solution. Of course, the more difficult it is to penetrate, the more it will be deposited on the surface. If its color is beautiful, such as red or yellow, we call it Fei, but if it is brown or brownish gray, we call it dirty. These dirty colors will affect the transparency and green performance of jadeite, so some businessmen think of removing these dirty colors, which is the original intention and purpose of doing B goods.
What we are talking about now is not only curing, but also granulating with strong alkali (NaOH), because the smaller the particles, the higher the transparency in the future. After granulation, the jadeite looks like lime, and it is all powdery, so it can't be used at all. It can only be reinforced with glue such as epoxy resin. In this way, the dirty colors in jadeite (especially brown, yellow and red) do not include black, because some black is crystallized with jadeite at the same time, and acid cannot react with them. )
Due to acid-base corrosion, the gap between jadeite particles will become larger. Although it will be filled with glue, due to the great difference in hardness with jadeite, it will still sag during polishing, forming an acid-etched reticular pattern network. Due to the uneven surface and the influence of glue, the surface luster of jadeite is waxy, which is not as bright as natural jadeite. ：
Question 2: How to identify the authenticity of jadeite? Distinguish between true and false jadeite: first, look at the light obliquely to see if there are any natural holes on the surface. If there is, it's really smooth. Second, drop a drop of water on the jade surface with a toothpick. If it is true, it will hang on it like dew, not fake. Be sure to clean the jade before inspection. Third, look at the hardness. Rub the jade hard on a piece of glass, and then see if the jade is worn. If you do, it's probably fake.
Question 3: How to distinguish the authenticity of jadeite by the simplest method? Identification of jadeite jade can be divided into (1), modeling identification (2), jade quality and jade material identification (3), decoration identification (4) and style identification. The identification of Qin color focuses on learning and understanding the color change between ancient jade and objects that have been in contact with various storage environments for a long time, but it is actually a physical phenomenon, and the natural quality change it produces is color change. We usually call it "Qin color". For example, ancient jade stored in red paint may be red, black paint may produce black, and buried in loess may produce yellowish brown mud. Observing under strong white light, Qin color usually occurs in the place where jade contact is weak or naturally cleavage wrinkles. Then along the cleavage or fissure, the penetration expands, which can seriously soak the whole organ, which is called "total immersion". After playing, the color is bright, and the color of the piano mostly changes from gray to red. The important point is: under normal circumstances, genuine products are relatively simple; The darker the color, the more chaotic the piano color and the bright piano color are questionable. Even if the real jade has cleavage and cracks, it is not a contact part and does not necessarily have bright colors. Imitate the color of the piano by chemical or physical methods, usually the whole piano. There is also local soft mud, which is characterized by its Qin color. It is not necessary to burn pseudo-ooze in the soft rib or crack of jade. This can be observed under intense white light. However, it is useful to forge the Qin color by laser along the cleavage or fold of jade with high technology. Another point is that the storage environment of jade is dry or jade is dense. Look at the color: natural jadeite has natural color, uneven distribution, prolonged green trend and generally no fluorescence. Look at the polished surface: the polished surface of natural jadeite is fine and smooth, with grease showing a strong glass luster. 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". Listen to the sound: tap the natural jade gently, making a crisp and pleasant sound. If it is artificially processed, it will make a dull sound. In addition, because of the high density of jadeite, it feels like a thug by hand; Jade has a strong water-holding ability. When it drops on it, the water drops protrude higher. At the same time, some experts remind consumers that when buying high-priced jewelry and jade, they should choose formal 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 the "CMA" logo. Usually, every precious piece of 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. First-class jade, moist, thorough and greasy, is moist in your hand. The main method to identify the authenticity is to use a magnifying glass or microscope to see that there is a fiber interwoven structure inside the jade, and the particles are fine; Artificial glass has no structure and bubbles can be seen. You can also carve it in an inconspicuous place with a knife. What can be carved must be fake jade, but what cannot be carved is real jade. As the saying goes, "Gold is valuable, but jade is priceless". Because the top grade Hetian jade is getting scarce, it can reach tens of thousands to hundreds of thousands of yuan per kilogram, while the average Qinghai white jade and Russian white jade are only a few thousand yuan per kilogram, so some people mix it with Hetian jade. The minerals of these jadeites are basically the same as Hetian jade, but the surface color is dark and not soft, which will be even dimmer after a long time. Old jade and new jade can be distinguished from two aspects. There is an oxidized jade skin on the surface of the old jade, commonly known as "patina", which is similar to the skin of autumn pear and obviously different from the natural color of jade, while the new jade does not. Judging from the theme of sculpture, ancient jade is a symbol of rank and power, and there are many mythical flowers, birds and figures, such as dragons and phoenixes. New ones are generally auspicious themes. Jade has been closely related to China culture since ancient times. People's interest in jade is not only that it is a crystal clear, colorful and pleasing ornament, because jade has wealth effect, is hard currency and has great appreciation potential. In gemmology, people divide it into two categories: jadeite and jade in a narrow sense. There are only two kinds of jade, jadeite (also called jadeite) and nephrite, which are divided into white jade, white jade, jasper and jet according to different colors. Others, such as agate, pith, jadeite, turquoise and lapis lazuli, belong to general jade. Most importantly, there are three levels of identification problems in purchasing jadeite and nephrite. Whether it is real jade or nephrite, you should know that there are a lot of imitations that look like jade and nephrite on the market now. Some are completely different from jadeite and nephrite in material composition, but there are some similar natural substitutes in appearance, such as Australian jade, albite jade (commonly known as water foam) and Wulan Cuimayu. It can be used for Jing Baiyu and Ah Fu to pretend to be white jade ... >>
Question 4: What do jadeite think of true and false? This is to see the truth. This is a relatively simple method to identify true and false!
1; I just put jade on my face and felt very cold. If it doesn't get cold for two or three seconds, it means it's true. Because jadeite can transfer heat and dissipate heat quickly! If it is not cold on the face, it is fake.
2; That is, the magnifying glass should be 10 or 30 times to look at the crystals inside to see if there are any small cracks like cobwebs, and whether the color is on the cracks or on the jade surface. If there is, it is fake. Hetian jade looks like rice paste, because the crystal is fine and the color is even. Jade looks like the wings of a fly, some like a little ofloxacin, and some like broken glass. Because the jadeite crystal is not delicate enough, there are many colors on the same jadeite.
3; It's an appraisal of destruction. Set it on fire. It's just burnt black, burnt yellow and stinky. Black and yellow are fake if they are not washed off. It's burnt and smelly. That's even more fake. (If the fire really comes, there will be small water droplets attached to the jade, but if it is fake, there will be no small water droplets attached to the jade.)
Question 5: How to identify the authenticity of jade pendant? There are star-shaped, linear and flaky flashes on the surface of jade. The color of jadeite is rich and colorful, which is not found in other gems, so we should not only look at the color and tone, but also pay attention to the combination and distribution of colors. The luster of jade is glass luster, greasy luster or greasy glass luster. Jade with good transparent water head is thoroughly hydrated, which is not available in other jadeites. Put the smooth surface of jade on your face or lips to feel cool. Simple identification method: 1. Looking at the sunshine, there are some foggy things in jade, like cotton wool. 2. Jade is very hard, like a diamond, so you can draw a series of marks on the glass. Generally, the hardness of small steel knives is about 5.5. Poke the jade hard and you can see the imitation and the fake at a glance. It's cold to stick jade on your face. It is true that it is not cold after two or three seconds. Because jadeite can transfer heat and dissipate heat quickly! If it is not cold on the face, it is fake. 4. Take a magnifying glass of 10 or 30 times to see if there are any small cracks like cobwebs, and whether the color is on the cracks or on the jade surface. If there is, it is fake. Jade looks like the wings of a fly, some like a little ofloxacin, and some like broken glass. Because the jadeite crystal is not delicate enough, there are many colors on the same jadeite. 5, destructive identification, fire. It's just burnt black, burnt yellow and stinky. Black and yellow are fake if they are not washed off. It's burnt and smelly. That's even more fake. (Really, when the fire comes, there will be small water droplets attached to the jade surface. When it is burnt black, it will return to its original color after washing. But we generally don't use this method, which is not good for jade.
Question 6: How to distinguish fake jade bracelets? Some fake jadeites are artificially melted by glass, with loose structure, uniform and dark green color, some with bubbles, and hoarse when struck with hard instruments. Fake jade: Ma Laiyu (Emerald) is as transparent, green and beautiful as high-grade jade. But it's not hard to identify. Looking at it with a magnifying glass under strong light, there are fishnet-like patterns inside. The mesh of fishing net is green, and the mesh is white, unlike the green in jade, which is uneven in size and shape. Want to know more specifically, you can go to tshouji/category.php? Id=24 Look, the website is very detailed. I hope the information I provided is helpful to you.
Question 7: How to tell the true and false jade beads? Hello, it's really impossible to evaluate only by data or text description. I need your illustrations to see if I can help you evaluate them.
For mobile phone users, please install Baidu Know Client to explain.
Or you can upload the picture to your Baidu space photo album, and I can check it.
thank you
Question 8: How to identify the authenticity of jadeite? Jade identification refers to the identification of jade products, which can be generally divided into two aspects: instrument detection and manual identification. In instrument testing, the structural crystal is usually tested by polarizer and the refractive index is tested by refractometer. Its color elements are tested by color filter, density is measured by density method, hardness is obtained by hardness tester, and color spectrum is tested by spectrometer. The scientific nature of instrument detection is very high, and it is undoubtedly very correct to detect reliable basis with the help of modern scientific and technological means, which can only be mastered by professional workers. For the vast majority of jade lovers, it must be identified by traditional manual identification methods. The process of manual appraisal is an accumulation process, which requires a long period of practical experience accumulation. Generally speaking, we should start with the following characteristics of jadeite: 1. Structure: The structure of jadeite is a patchy structure, which refers to the structure that fine fibrous mineral crystals around transparent granular patchy crystals are interwoven under metamorphism. In jadeite, opaque or slightly transparent white fibrous crystals are intertwined to form small pieces of white flowers, so they are called stone flowers or stone brains. 2. Seed pits: The seed pits of jadeite are composed of structure and texture, and jadeite is composed of small crystals. The smaller the grain, the denser the texture, the better the transparency and the better the polishing effect. In the jewelry industry, pits are divided into old pits (also known as old pits) and new pits (also known as new pits). Old pits have bright colors, high transparency and the best quality. Although the new pit is fresh and tender in color, its transparency is poor. Old pits and new pits are determined according to the age when jadeite was formed. 3. Color: The difference of jade color grade is reflected in the great correlation in value. When identifying jadeite, we must distinguish its colors, mainly red, green and purple. Green in monochromatic jadeite, rich and pure purple and red are all high-grade colors in jadeite, especially green is the most expensive. Emerald green should be strong, sunny, handsome, straight and harmonious. The best green varieties are Ruby Green, Glass Green, Brilliant Green and Mabel Miao. 4. Water head: Water head is the transparency of jadeite. The higher the water head, the better and more precious the germplasm is. You must be very careful when observing the head of jadeite, because the transparency is related to the thickness of jadeite itself. In addition, special attention should be paid to the place where the jadeite finished product has been tampered with, such as hollowing out the middle of the finished product. There is also the need to pay attention to agate products, because the transparency of agate is better, so some people color agate to imitate jade. In Hongkong and Taiwan Province, the transparency of jadeite is divided into three grades: transparency, transparency, transparency, ice and jade, among which jade is the top grade. 5. Land: the land of jade is better, whether it is fee or Cui. The external texture should be fine and even, and the internal texture should be solid, moist, clean and full of water. Good land should coordinate with the color of jade and take care of each other, thus setting off the richness of jade color. The best jade floor is glass floor and egg white floor. 6. Glossy: As a gem, jadeite requires high gloss. It is an intuitive reflection of the quality of jadeite, and it must have a strong glass luster or pearl luster of oil. 7. Handfeel: Due to the high hardness of jadeite, compact and delicate structure, good polishing degree and good finish, it feels very warm and smooth when touched by hand. In addition, it feels cold to stick jade on your face or on the back of your hand. 8. Perfection: refers to the perfection of jade, including jade without flaws, perfect shape and large volume. We should treat this point of internal defects dialectically. Generally speaking, those without black spots, stone flowers and cracks are better than those with these defects, but sometimes weak defects, as long as they are not in the conspicuous part of the finished product, will not only affect the price of jadeite, but will be the basis for confirming that it is genuine, especially in the market where fakes are everywhere now. In the international jewelry market, jadeites are usually divided into three categories according to color, transparency and texture, and each category is divided into four grades: A, B, C and D. The prices of jadeites in different categories and grades vary greatly. The first category is Wang Yu, the emperor. It is the top grade of jadeite, with green and pure color, rich and uniform color, high transparency, sufficient water head and authentic old varieties, and its output only accounts for 5% of the world's annual output. This kind of jadeite is very expensive. The unit of measurement is carat, which ranks among diamonds ... >>
Question 9: How to identify jadeite? It is not necessarily true that there is an appraisal certificate. You have to be a professional in this industry to see it. I can send a picture to help you have a look.
Question 10: How to test the authenticity of jade bracelets (1)? See the texture, listen to the sound and take photos with Charles filter.