Experience, skills and identification of jadeite

Look at the luster of the jadeite raw stone: After the jadeite is soaked in strong acid and alkali, its structure will become loose, and corrosion pits can be seen on the surface before filling, causing diffuse reflection and weakening the luster. After adding organic fillers such as resin or plastic, jadeite raw stone often has resin luster, waxy luster, or a mixture of glass luster, resin luster and waxy luster.

2. Look at the color of the jadeite raw stone: Since the structure of jadeite is destroyed, the original optical properties of the jadeite are also changed, so the color distribution of "B-grade jadeite raw stone has no sense of hierarchy. Although the green color of jadeite treated by this method is still the original color, after being soaked in acidic solution, the base becomes white, the green distribution is more floating, and the original color orientation is also destroyed. Such jadeite raw stone looks very unnatural.

3. Look at the structure of the jadeite raw stone: After the jadeite raw stone is soaked and corroded by strong acids and alkalis, some substances are brought in and out, forming dissolution along the mineral crystals on the surface and inside, and producing internal interconnected cracks. Under transmitted light, the crisscrossing cracks inside can be seen. Under reflected light conditions, the surface dissolution pits or spider-web-like patterns are clearly visible.

4. Look at the surface characteristics of the jadeite rough stone: Some jadeite rough stones will be filled with fillers. Due to the large difference in hardness between the fillers and the jadeite rough stone itself, the jadeite rough stone will show obvious grooves at the original cracks. The fillings are obviously lower than the two sides, and many cracks form criss-crossing ditches. Cementation or residual bubbles can be seen in the larger "ditches". The surface of jadeite that has been bleached and filled with better processing technology in recent years is very smooth, without the above phenomenon, and requires more careful observation and measurement.

5. Look at the density of the jadeite raw stone: The density and refractive index of the jadeite raw stone that has been treated with bleaching and filling are lower than those of the natural jadeite raw stone. However, due to the complex mineral composition of the jadeite raw stone, the density and refractive index values ​​of some natural jadeite may also be low. Therefore, the density and refractive index can only be used as reference data, and usually cannot be used as a direct basis for determining whether the jadeite has been filled.

6. Check the fluorescence of the jadeite raw stone: Jadeite raw stone usually has no ultraviolet fluorescence or weak to strong fluorescence, and the fluorescence is evenly distributed or spotted. Most of the early "B-grade" jadeite has fluorescence. Short wave: weak, yellow-green or blue-green (blue-white); long wave: medium to strong, yellow-green or blue-white. However, jadeite treated with this method recently usually has weak or no fluorescence. In addition, magnified inspection is also an effective method to identify jadeite raw stone. By combining surface observation and internal observation and observing its internal characteristics, it can still be identified. Basic identification of jadeite rough stone: First of all, when identifying jadeite rough stone, you should pay attention to whether there are small skins on the large piece of raw stone. Rubbing a small piece of leather is also called rubbing a small mouth or opening a small window. Such materials usually have more cracks, more defects, or unevenness, so we dare not open a large window or rub off more leather. At the same time, we should also pay attention to the characteristics of the original stone cut and lid. Secondly, when identifying jadeite gambling stones, novices should pay attention to the phenomenon that the jadeite raw stones have knocks, breaks or cuts but are not polished. Hiding the truth and showing the false is the trick used by unscrupulous merchants. They do not polish the jade, but instead knock, break or cut it. Here they do not want people to see the true condition of the jade. It is very likely that it is not a good piece of jade, so they are unwilling to polish it. After polishing, people can see that its texture and other quality conditions are not good. Some new jade from the field with poor quality are often burned with fire in order to impersonate old jade from the field. Or because the green color of the jade mouth is not correct or the water quality is not good, it is burned with fire so that people can't see clearly, and then it can be sold at a high price. Finally, we must also pay attention to fake Wusha. People in the know know that the raw material with black sand-like skin is very likely to contain high-quality emerald green inside. If small holes are rubbed out, it will look very green from the edges, but in fact the raw stone is not jadeite. Not only that, the full green at the cut of the raw material is not a sign of the authenticity of the jadeite gambling stone. Even if it is real green, you cannot only look at the opening, because this is the best part of the entire piece of jade. It is necessary to observe the entire piece of jade in detail and measure its value from the perspective of craftsmanship. Pay attention to the traces of green left on the jade raw materials. Tips for gambling on jadeite: When gambling on jadeite, quality assessment under the light is particularly important. Because the color of jadeite gambling stones, especially the gray, blue and oily green colors, the visual effect under the light is much better than the color effect under natural light. Therefore, you can only see the cracks, water head length, reflection degree or other characteristics of jadeite under the light, while the green color of jadeite should be observed and evaluated under natural light. For high-end jadeite, the price difference may be more than ten times. For example: a jade ring face worth 500,000 yuan and a jade ring face worth 5 million yuan, the jade quality, style, size, water quality, and flaws are all first-class and impeccable. The key price difference between the two lies in the level of green. It is extremely important to know how to recognize and distinguish the various differences in jade green, or at least see and experience them. Regarding the green shape characteristics of jadeite raw stones, "a line" of green and "a large piece" of green near the skin are two manifestations of the same green shape, which is the difference between the vertical "line" and the horizontal "piece". The thickness of the "line" is known, but the depth is unknown. The area of ​​the "sheet" is known, but the thickness is unknown. In short, don’t be confused by the “more” or “less” green on the surface of the jadeite gambling stone, but recognize the nature of the “vertical” and “horizontal” nature of green. Therefore, it does not mean that you should not buy jadeite if you see a large area of ​​green, but it is a reminder not to have excessive expectations for the thickness of the green. Finally, let’s talk about the python belt in the jadeite raw stone: Someone said that the python belt is like a river in the stone, and the color flows in the stone like a river! There is also a kind of anaconda, which is a kind of very good water ribbon flowing through the stone! On the surface it looks like a trickling stream flowing through rocks!

1 Python belt: On the skin of the jadeite raw stone, strips and blocks that are different from other places appear, and even wrap around most of the jadeite raw stone. Some are arranged in the shape of sand grains, and some are like pythons or ropes. We call them pythons, ropes, and python belts. This feature looks a bit ugly, but it is an important sign to determine whether the jadeite raw stone has quality, water and color. Generally speaking, the green areas inside the jadeite raw stone, or the protruding areas of very old jadeite, form a python belt. 2 Characteristics of python belt: It protrudes from the surface of the leather shell, is delicate and smooth, and does not feel rough when touched by hand. If there are loose flowers on the python belt, it is a better sign. The color, direction, shape and tendency of the python are all factors in judging the green color of the jadeite raw stone. When identifying a python belt, the color of the python is often not significantly different from the surrounding area. The patterns are sometimes obvious and sometimes vague and difficult to distinguish. It requires familiarity with the field and the patterns of the jadeite raw stone, as well as careful and patient observation and exploration over a long period of time to avoid mistakes. 3 White python: Unlike the original color of the stone, the python is white, called a white python; there may be white pythons on white stones, which are difficult to identify. Among this type of pythons, the best ones are grayish white, especially when there is a grayish white python on a black stone, like snot, the chances of betting on an increase in value are very high. If there is a little pine flower on the python, it would be a rare performance. As long as the stones from the Lao Pa-gan field in the old field have pythons in them, you can bet on them. If they are the black sand from Lao Pa-gan and have python-like tendons in them, you can also bet on them! 4 Silky Python: The surface of the stone has silky patterns like wood grain. The color inside is also silky. Even if it is the black sand of Lao Pa Gan, if its skin is silk python, the inside is silky green and will not be connected into a piece. 5. Belt python: A python is wrapped around the middle or head of a stone like a belt. If the belt is like a twisted rope, it is called a tight python. This phenomenon often indicates that the color inside is good. If there are pine flowers on such a python, it must be colorful, so don't miss it! 6. Kasan python: This kind of python is usually colored, with pits and bumps on its body, like a honeycomb. Most stones with the card three python have half thin skin and half thick skin, with a higher jade content, so they are more likely to bet on. It should be noted that if the python has formed a plaster-like state, that is, a layer of skin like a plaster, then the jade content inside will not be high, or even colorless. If you are interested in jadeite, you can click to follow us. We will update it every day.

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