To identify the quality of jade, there are six standards, namely, "color, transparency, uniformity, shape, knock, and photo". It is more precise than the Anglo-American Jewelry Association by "color, transparency, uniformity, shape". (1) Color: Jade is best in green, and the value of red and purple jade is only 1/5 of that of green jade. If the jade contains red, purple, green and white, it is called "Fu Lu Shou Xi"; if it only contains red, green and white, it is "Fu Lu Shou". The color of jade is dim and the yellowish color is the lower product. If monochromatic jade, it is better to choose uniform. (2) Transparency: transparent crystal such as glass, no dirty spots, no hairpins, no hairpins for top grades. Translucent and opaque jade are called intermediate jade and ordinary jade. Before the Qing Dynasty and the Qing Dynasty, jade with red, green and white colors was called jade jade. In modern times, jade jade refers to the general transparent jade. The current jade jade is mostly transparent and green. (3) Uniform: The color of jade is uniform, such as white and green, and the color is uneven, the value is very low. (4) Shape: The shape of jade can be processed into different styles according to different aesthetic requirements, without special standards. Generally speaking, the bigger the jade is, the better. (5) Knocking: There are often breaks and cuts in jade, which are generally difficult to observe. If you knock with a metal rod or throw the jade gently on the platen, the presence or absence of cracks can be discerned by the sound and turbidity of the sound. The crisper the sound, the better. (6) Photo: There are black spots and cockroaches in the jade that are hard to find with the naked eye. As long as you take a photo with a magnifying glass of 10 times, you can see at a glance. The quality of jade can be divided into 10 levels, and each level can be subdivided into upper, middle and lower. Among them, white jade has the lowest value regardless of its color and transparency. Natural jade is characterized by a slightly light color without a light blue color (commonly known as evil color). There is also a kind of synthetic jade, made of jade powder, crystal and salt water. The appearance is quite similar to the dark "old pit jade". The method of identification is very simple. Because it has different specific gravity from natural jade, it can be lightly weighted by hand, or weighed with a balance. The heavy one is true jade. There are many kinds of jade jewelry. When distinguishing, the first one is to look at the color of jade. Even in the same kind, the texture and color of different parts of it are different. Jade is colorful. If it is a single color, it is necessary to pick a uniform color. If there is a dark color on the same jade, the color tone is required to be beautiful and natural. The second is to look at the texture of jade, pure, smooth and crystal clear, can not have dirty spots or hairpins, dry; jade often has flaws, that is, cracks of varying lengths, which are defective products. The third is to look at the workmanship. The jade is to be polished by diamonds or diamonds. The rough trade unions have traces of friction on the surface of the jade, and there is no luster. Good workmanship should be fair and shiny. It belongs to the jade inlaid on gold and silver jewelry, but also depends on whether it is firm, Zhou Zheng, and unified. General identification of fake jade The fake jade mainly has two types, jade and artificial jade. (1) Similar to five. It is made of colored natural ore, which is easy to be confused because its appearance and texture are similar to jade. For example, Dongling jade, Chi Wenyu, and Australian jade: all resemble jade. Its physical properties (hardness, refractive index, specific gravity) are different from true jade. (2) Artificial imitation jade. It is a jade ornament made by dyeing glass, plastic or other materials by artificial methods. Such imitations are easier to identify, such as glass products. Most of the bubbles are visible under sunlight or light, and the color is very bright, and the green color is blue, which is different from true jade. The plastic products are light in weight, poor in transparency, dull in color, and harder than the real jade. It can be found that it is different from real jade by hand. Handling jade identification The processing jade mainly includes three types: bleached jade, dyed jade and electrochromic jade. The jewelry industry divides jade into three grades: A, B, and C. Grade A is the original jade without any bleaching or fading; Class B is jadeite that has been bleached and faded; Class C is jadeite that has been dyed or electrochromic. Grade B and Grade C are processed jade. (1) Bleached jade (B grade jade). It is to use a strong acid to remove the variegated colors (such as grayish yellow, grayish black, etc.) in the jade, so that the main color is more vivid, such as "white-green" jadeite. Due to its acid treatment, the internal structure is greatly damaged, and the texture is deteriorated and fragile. (2) Dyed jade (C grade jade). It is to indirectly heat the colorless five, so that the small hole in the jade is expanded, and it is colored in the dyeing liquid. It must be repeatedly heated and dyed for more than ten times to obtain the effect of colored jade. The texture of the jade used must be hard. There are no cracks due to the hot and cold process. Both types of jade must be made of colloidal (epoxy resin) as a hole-filling material to enhance the firmness. However, its gum will turn yellow due to external factors. (3) Electrochromic jade (C grade jade). It is a layer of color appearance on the inferior jade plated by electroplating process, which must be carefully observed to distinguish it. If there are some small cracks in the green with blue in the jade, it means that it is an electric jade. Because it will leave cracks when plating, it is called "spider claw" and can be observed with a magnifying glass. Black For Hard Floor Rectangle Pvc Black For Hard Floor Rectangle Pvc,Anti Slip Table Mat,Non Slip Step Pads,Small Non Slip Mat Taizhou Ruihu Plastics Co.,Ltd , https://www.tzruihu.com