Jadeite of superior quality is called jadeite. Color, transparency, uniformity, shape and knocking are the methods for ordinary people to watch or evaluate jade. Jade is divided into: glass type, dark old pit, old pit, gold wire, Youqing, bean green, flower green, melon green, etc. Let's take a look with this website.
Valuation principle of jadeite
1. The more delicate and green, the more valuable.
2. Transparency: jadeite has close crystal structure, good texture and high transparency. What we call "glass type" is a kind of jadeite with high transparency. If the jade itself is rich in chromium, it forms ice jadeite, which is valuable and difficult to find.
3. Color uniformity: in addition to the delicate green color and high transparency, the top grade must be uniform color.
4. Defects: pay attention to whether there are cracks, spots, etc. these defects will affect the quality of jadeite.
5. Shape: most jadeite ring faces are oval egg shaped, while there are many other shapes. The quality and beauty of the shape also have an impact on the price of jade.
6. Carver or grinder: the quality of the time and symbolic significance of the decoration of the carving have an impact on the price.
7. Size and thickness: the price of jade of the same quality is higher because it is large and thick.
8. Gloss: in addition to the above conditions, the gloss should be bright and not dark.
Raw material selection
Wipe skin
Wiping the skin is an ancient rule, also known as peeling or wiping the stone. It belongs to the conservative method of gambling stone. Because cutting the jade without determining the specific part of the jade is easy to "untie" the green, so the effect of wiping the skin is good and safe. Wiping leather mainly depends on fog, background and color. Because with the wipe, you can see some changes in the jade with strong light to judge the depth, width and intensity of green. The order of wiping the skin: first, wipe the fine, second, wipe the dry, third, wipe the ringworm, and fourth, wipe the pine flower. There is only one purpose to wipe the stone, that is to find the real green color.
Stone cutting
The original cutting method was to press sand with a hacksaw and slowly cut the stone. If it is found that cutting cannot be continued, it is convenient to take measures to save it. The other is to use the jade cutting machine, which uses the cutting blade plated with emery layer, which is accurate and fast. In order to reduce the loss and smoke pollution and protect the cutting blade, the oil immersed cutting machine is often used. However, it is not easy to see the cutting process because the clamp is holding the stone in oil or water, and it must be completely untied to know the win or loss. Therefore, the position must be found before cutting. Generally, the knife is cut from the wiping mouth or from the head. It can also be cut from pine flowers or along cracks. When the color of the first knife is not visible, the second knife and the third knife can also be cut. In the jargon, "one knife is poor and one knife is rich" refers to this truth.
Grindstone
Grindstone is to polish and show the transparency completely, so that people can see its good color or water. If the raw materials are coarse and not polished, the method of coating clean water on the original stone can also be used to increase the transparency of jadeite raw materials. One kind of grindstone is dark gambling (mengtou gambling). The stone has no trace of rubbing and cutting, and there is no natural fracture; The second is half light and half dark gambling. When there is a knock, wipe or small gap on the stone, you can see the clues of water and color inside the gambling stone, and bet on the rest of the parts that can not be observed smoothly. This still has great gambleability.
Cleaning and maintenance of jadeite
Clean and maintain the jadeite regularly: if the surface is dirty due to long-term wear, clean it with clean water and then gently sweep the jadeite with horsetail bristle brush. In this way, it is difficult for corrosive substances to exist on the surface of jadeite for a long time to damage it. Remember, it's best to remove the jade when bathing or exercising. If it contains acid-base substances, it is easy to reduce the luster of sweat in the bath for a long time. Usually, jadeite can be moistened and maintained with a small amount of white tea oil after cleaning. It can not only lock the water of jadeite without loss, but also improve the luster and lubricity of jadeite.
In addition: during each cleaning, pay attention to whether the hanging rope is worn and whether the inlaid ornaments are loose. In this way, timely repair and maintenance can be found and sent back to the store for maintenance, so as to avoid the damage and loss of jadeite due to the breakage of hanging rope and the loosening of inlay.