How to identify the quality of jade

There are six standards to identify the quality of jade, namely "color, transparency, uniformity, shape, percussion and luster", which are more detailed than the standard of "color, transparency, uniformity and shape" only by the Anglo-American Jewelry Association. (1) color: the use of jade ... There are six criteria for judging the quality of jade, namely "color, transparency, uniformity, shape, percussion and luster", which are more detailed than the only "color, transparency, uniformity and shape" of the Anglo-American Jewelry Association. (1) color: green is the best jadeite, and the value of red and purple jadeite is only 1/5 of green jadeite. If jade contains red, purple, green and white, it is called "Fulu Xi Shou"; If it only contains red, green and white, it is "Fu Lushou". Jade is inferior in color and yellowish. If it is monochrome jade, it is best to choose uniform jade. (2) Transparency: as transparent as glass, without dirty spots, chaff and astringency. Translucent and opaque jade are called intermediate jade and ordinary jade respectively. Before and during the Qing Dynasty, jade with red, green and white colors was called jadeite. In modern times, jadeite refers to generally transparent jade. At present, jadeite is mostly transparent and green. (3) Uniformity: the color of jade is uniform. If it contains white and green but the color is uneven, its value is very low. (4) Modeling: The modeling of jade can be processed into different styles according to different aesthetic requirements, and there is no special standard. Generally speaking, the bigger the jade, the better. (5) Knocking: There are often cracks and cuts in jade, which are generally not easy to observe. If you knock with a metal bar, or throw jade gently on the table, you can judge whether there is a crack by the clarity of the sound. The louder, the better. (6) Photo: There are black spots and flaws in jade that are not easy to be found by naked eyes. As long as you take a photo with a magnifying glass of 10 times, you can have a panoramic view. The quality of jade can be divided into 10 grades, and each grade can be subdivided into three grades: upper, middle and lower. Among them, white jade has the lowest value regardless of color and transparency. Natural jadeite is characterized by slight light color, without light blue (commonly known as evil color). There is also a synthetic jade, which is made of jade powder, crystal and salt water, and looks quite like a dark "old pit jade". The identification method is very simple, because it is different from natural jade in proportion. It can be said by hand or with a balance, and the heaviest one is the real jade. Quality appraisal of jadeite jewelry There are many kinds of jadeite jewelry. One is to see the color of jade. Even in the same category, the texture and color of different parts are different. Jade is colorful. If it is monochrome, it is necessary to choose a uniform chromaticity. If there are shades on the same piece of jade, it is required that the tone lines are beautiful and natural. The second is to look at the texture of jade. It is best to be pure, smooth and crystal clear, and there can be no dirty spots or chaff and dryness. Emerald often has wrinkles, that is, broken lines with different depths and lengths, which are inferior. Third, look at the workmanship. Jade should be polished with diamonds or emery. Rough trade unions make the surface of jade have friction marks and have no luster. Good workmanship should be neat and shiny. If jade is embedded in gold and silver jewelry, it depends on whether it is firm, geometric and harmonious. There are two kinds of fake jade: similar jade and artificial imitation jade. (1) is almost the same as five. It is carved from colored natural ore, which is easy to be confused because of its similar appearance and texture to jade. For example, Dongling jade, Chi Wenyu and Australian jade are all similar jade. Its physical properties (hardness, refractive index and specific gravity) are different from those of real jade. (2) Artificial imitation of jade. That is, glass, plastic or other materials are made into jade ornaments after artificial dyeing. This kind of imitation is easy to identify, such as glass products, which are mostly visible in sunlight or light, with bright colors and blue in green, which is different from real jade. Plastic is light in weight, poor in transparency, dull in tone and much lower in hardness. (5) Knocking: There are often cracks and cuts in jade, which are generally not easy to observe. If you knock with a metal bar, or throw jade gently on the table, you can judge whether there is a crack by the clarity of the sound. The louder, the better. (6) Photo: There are black spots and flaws in jade that are not easy to be found by naked eyes. As long as you take a photo with a magnifying glass of 10 times, you can have a panoramic view. The quality of jade can be divided into 10 grades, and each grade can be subdivided into three grades: upper, middle and lower. Among them, white jade has the lowest value regardless of color and transparency. Natural jadeite is characterized by slight light color, without light blue (commonly known as evil color). There is also a synthetic jade, which is made of jade powder, crystal and salt water, and looks quite like a dark "old pit jade". The identification method is very simple, because it is different from natural jade in proportion. It can be said by hand or with a balance, and the heaviest one is the real jade. Quality appraisal of jadeite jewelry There are many kinds of jadeite jewelry. One is to see the color of jade. Even in the same category, the texture and color of different parts are different. Jade is colorful. If it is monochrome, it is necessary to choose a uniform chromaticity. If there are shades on the same piece of jade, it is required that the tone lines are beautiful and natural. The second is to look at the texture of jade. It is best to be pure, smooth and crystal clear, and there can be no dirty spots or chaff and dryness. Emerald often has wrinkles, that is, broken lines with different depths and lengths, which are inferior. Third, look at the workmanship. Jade should be polished with diamonds or emery. Rough trade unions make the surface of jade have friction marks and have no luster. Good workmanship should be neat and shiny. If jade is embedded in gold and silver jewelry, it depends on whether it is firm, geometric and harmonious. There are two kinds of fake jade: similar jade and artificial imitation jade. (1) is almost the same as five. It is carved from colored natural ore, which is easy to be confused because of its similar appearance and texture to jade. For example, Dongling jade, Chi Wenyu and Australian jade are all similar jade. Its physical properties (hardness, refractive index and specific gravity) are different from real jade' (2) Artificial imitation jade. That is, glass, plastic or other materials are made into jade ornaments after artificial dyeing. This kind of imitation is easy to identify, such as glass products, which are mostly visible in sunlight or light, with bright colors and blue in green, which is different from real jade. Plastic is light in weight, poor in transparency, dull in tone and far less hard than real jade. When you weigh it with your hand, you will find that it is different from real jade. Identification of processed jade There are three kinds of processed jade: bleached jade, dyed jade and electro-colored jade. In the jewelry industry, jadeite is divided into three grades: A, B and C. Grade A is the original jadeite stone that has not been bleached and dyed. Grade b is bleached jadeite; Grade C is jadeite that has been dyed or electrochromatically treated. Grade b and c belong to jade processing. (1) bleached jade (grade b jade). It is to remove the variegated colors (such as grayish yellow and grayish black) in jadeite with strong acid to make the main colors more vivid, such as "jadeite with white background". Due to acid treatment, its internal structure was greatly destroyed, and its texture became worse and more brittle. (2) Dyed jade (Grade C jade). Colorless five is indirect heating to expand the pores in jade, and then put it into dye solution for coloring. It must be heated and dyed for more than ten times to obtain the effect of colored jade. The jade material used must be hard. There are no cracks caused by cold and hot processes. The above two kinds of jade must be filled with colloid (epoxy resin) to strengthen their firmness. But the gums will turn yellow due to external factors. (3) Electro-colored jade (Grade C jade). Inferior jade is plated with a layer of color appearance through electroplating process, which must be carefully observed to distinguish it. If there are some small green cracks with blue color on the jade, it means that it is electro-colored jade. Because electroplating will leave cracks, which are called "spider claws" and can be observed with a magnifying glass.