Identify jadeite jade, divided into

(1) Modeling discrimination.

(2) Identification of jade and jade materials

(3), pattern identification

(4) Style discrimination.

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.

When buying expensive jewelry and jade, you should choose a regular well-known jewelry store or a large reputable shopping mall. 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.

Is it really jade or nephrite?

You know, there are a lot of counterfeit products that look like jadeite 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. Can be used to impersonate white jade, afghanistan white jade, white marble, etc. Although the appearance of these substitutes is very similar to that of genuine products, they also have certain self-value, but because their quality is not as good as that of genuine products, or because of their abundant output in nature, they cannot be compared with genuine products in market price. If you buy them back as natural jadeite or white jade, you will naturally suffer. Some imitations are completely artificial, such as using green glass as jade.

Distinguish artificially beautified jade

The so-called "B-grade jadeite and C-grade jadeite" are real natural jadeites, but their raw materials are relatively poor. In order to improve its appreciation and decoration, people have beautified it to varying degrees. Among them, B jadeite is used to wash some jadeites with low transparency and deep color with strong acid, so that some impurities are washed away, thus improving the transparency and making the color more gorgeous. However, the strength of jadeite will be damaged, so it is necessary to inject resin curing agent into jadeite under vacuum to improve its strength. Therefore, the goods B are actually the jadeite with acid pickling and glue injection. Although this kind of jadeite is very ornamental and decorative, after all, its strength is damaged and it is not durable, so it can't be compared with the real completely natural A-grade jadeite in price. Grade C jadeite is a low grade jadeite. It didn't have a beautiful color at first, but the color we see now is artificially dyed later, so the price is lower. White jade is simpler than jade on this issue. It is common to give it a sugar color (brown like brown sugar) to pretend to be a high-priced sub-white jade.

Jade is of good quality.

This is a complicated subject, involving several evaluation factors. The first is color. For jadeite, pure emerald is better. The closer green is to the requirements of consistency, integrity, integrity and uniformity, the higher its value is, and sheep fat is the best for white jade. In addition, it depends on their brightness; Whether the texture structure is dense and delicate; Are there impurities, defects and cracks? What are the sizes of these impurities and cracks? Chennai: τ Tan? But also on their block size; More depends on whether their workmanship is good, whether they are famous, whether they are cultural relics left over from ancient times, and so on. Because of these differences, the price of two completely natural jadeites or white jade of the same size will be very different.

In fact, the best way to avoid being cheated is to ask the merchant to provide an authoritative appraisal certificate when you buy jade. If not, then you should ask him to clearly specify the correct name of the goods purchased on the invoice. In this way, after you buy, if you look for an appraisal department and find that it does not match the name of the purchased goods, you can return it to the merchant for compensation. If the invoice is ambiguous, for example, the word "jade" is vague, then even if you identify that what you want to buy is not natural A jade or white jade, but B jade or C jade, or even jade or other jade, the merchant will plausibly say that he has not deceived you, because the goods are really made of jade, and then you will eat jade.

Content source: National Cultural Market Survey and Evaluation Center (Art Lecture Hall)