Jadeite of superior quality is called jadeite. Color, transparency, uniformity, shape and knock are the methods for ordinary people to watch or evaluate jade. Jade can be divided into glass species, dark old pit, old pit, gold wire, Youqing, Douqing, Huaqing, Guaqing, etc. Let's have a look.
Appraisal principles of jadeite jade
1. The more delicate and green, the more valuable.
2. Transparency: jadeite with dense crystal structure has better texture and high transparency. What we call "Glass Seed" is jadeite with high transparency. If the jade itself is rich in chromium, it will form ice seed jadeite, which is valuable and difficult to obtain.
3. Color uniformity: in addition to the color of delicate green, high transparency, but also must be uniform tone is top grade.
4. Defects: pay attention to whether there are cracks, spots, etc., which will affect the quality of jadeite.
5. Shape: most jadeite rings are oval and egg shaped, and there are many other shapes. The quality and beauty of the shapes also have an impact on the price of jade.
6. Carver or grinder: the ornament of a carving piece. The quality of its time and the symbolic significance have an impact on the price.
7. Size, thickness: the same quality of jade, but the price is larger and thicker.
8. Luster: in addition to the above conditions, the luster should be bright and not dark.
Raw material selection
Wipe the skin
It is an old rule to wipe the skin, also known as peeling off the skin or rubbing the stone. It is a conservative way to open a gambling stone. If you cut the jade without determining the specific part of the jade, it is easy to "remove" the green color. Therefore, the effect of skin brushing is good and safe. The main factors of skin cleaning are fog, bottom and color.
Because you can use strong light to see some changes inside the jade, to judge the depth of green, width, intensity. The order of wiping the skin: one is to wipe the clothes, the second is to wipe the dry, the third is to wipe the tinea, and the fourth is to wipe the pine flowers. There is only one purpose of rubbing stones, which is to find the real green color.
Cutting stone
The original method of cutting is to press sand with a bow saw and cut the stone slowly. If it is found that the cutting can not continue, it is easy to take measures to save. There is also a kind of jade cutting machine, using diamond coated cutting blade, accurate and fast. In order to reduce the loss and smoke pollution and protect the cutting blade, oil immersed cutting machine is often used. However, it is not easy to see the cutting process when the clamp is sandwiched with stones in oil or water, so it is necessary to fully untie it to know the winning or losing.
Therefore, it is necessary to find the right position before cutting. Generally, the knife can be cut from the mouth of the brush or from the office of the emperor's office, or from Songhua or along the crack. When the color of the first knife is not visible, you can also cut the second knife and the third knife. This is what the jargon says, "a knife is poor, a knife is rich.".
Millstone
Grindstone is for polishing, to show the transparency completely, so that people can see its color or water is good. If the raw material is coarse and not polished, the method of coating water on the raw stone can also be used to increase the transparency of jadeite raw material.
One kind of millstone is dark gambling (mengtou gambling), and the stone has no scratch marks or natural fracture; the other is semi dark gambling, in the case of knocking, wiping or small gap on the stone, the clues of water and color inside the gambling stone can be seen, and the rest of the parts that can not be observed smoothly can still be gambled.
Cleaning and maintenance of jadeite jade
Clean and maintain the jadeite regularly: if the surface is dirty due to long-term wearing, 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 jade for a long time. Remember, when bathing or exercising, it is best to remove the jadeite. Because the bath or sweat contains acid-base corrosive substances, long-term in this environment, it is easy to cause gloss loss. Usually jadeite can be moistened with a small amount of white tea oil after cleaning. It can not only lock the moisture of jadeite, but also improve the luster and moisture of jadeite.
In addition: pay attention to observe whether the hanging rope is worn and whether the inlaid ornaments are loose when cleaning each time. In this way, timely inspection and maintenance can be found and sent back to the store for maintenance, so as to avoid the emerald damage and loss caused by the broken hanging rope and loose inlay.
