Visual identification: familiar with real jade. There are only two recognized real jade, jadeite and nephrite. Among them, the most expensive and popular jade (Burmese jade, Burmese jade, royal jade and Hetian jade) is mainly produced in Myanmar, and Guatemala, Mexico and Russia also produce a small amount of jade. 75% of the jade in the world comes from jade mines in British Columbia, all of which are nephrite. Nephrite is also produced in China, Taiwan Province Province, the United States and Australia (to a small extent). Familiar with imitation jade. The materials used to imitate jade include serpentine (also known as "new jade" or "olive jade"), prehnite, star color, timely garnet (also known as "Transvava jade"), chlorite (also known as "Australian jade"-mainly produced in Queensland and Australia) and Malaysian jade (a kind of transparent seasonal jade that can be permanently colored, often named after its color, such as ruby and topaz). The local Maori attach great importance to emeralds and New Zealand emeralds. According to color and transparency, they divided the green rocks into four categories: Cavaca, Kahulanji and Chananga. These three kinds belong to nephrite, and the fourth kind, tangiwai, produced in Sander, milford, is regarded as genuine by the world although it is expensive. 3 Observe the texture. If possible, you can observe the internal mechanism of jadeite with a magnifying glass of 10 times. Can you see fibrous or granular textures intertwined like asbestos? If so, this jade may be really nephrite or jadeite. On the other hand, chrysotile is a kind of microcrystal aggregate, which looks uniform under a magnifying glass. If you see a layered texture under a magnifying glass, your jade may have one or even two layers of other things superimposed on it (sometimes merchants will superimpose a thin layer of jade on other stones to achieve the purpose of confusing fish with pearls). Learn to see through deception. Even if you have real jade in your hand, there is no guarantee that it has not been tampered with. Common tricks include dyeing, bleaching, adding polymer stabilizers or overlapping with other materials. Jade can be roughly divided into the following categories according to the degree of adulteration: Grade A: pure jade, which has not been tampered with (such as high-temperature processing or high-pressure processing) except for traditional processing steps (i.e. sour plum juice washing and beeswax polishing). The color of this jade is pure. Grade B: This jade is bleached to remove defects, polymer is injected into the centrifuge to improve transparency, and the surface is covered with a hard and transparent plastic. This kind of jade is unstable and easy to fade after a long time, because polymers are easily damaged by heating and detergents. But in any case, this kind of jade still maintains the natural color of 100%, or is pure jade of 100%. Grade C: This kind of jade is bleached and dyed. If exposed to strong light, body temperature and detergent for a long time, it will fade easily. Throw the jade up and catch it with your palm. Real jade has a high density, so it is actually heavier than it looks. If the jade you weigh in your hand is heavier than other jade of the same size and there is nothing wrong with it, then it is probably real jade. Of course, this method is not very accurate, but it is easy to realize and more scientific. In the past, jewelers often used this method to distinguish real jade from fake jade. Listen to the sound. Another traditional method to distinguish truth from falsehood is to listen to sound. Listen to the sound of plastic beads knocking on each other first, then find a jade that you have identified as real jade and tap the jade you want to test. If it sounds like a plastic bead just now, then the jade you detected is probably fake. If the voice is deeper and louder than before, it may be true. Feel it with your hands. Holding jade in your hand, the real jade should be cold and smooth, a bit like holding soap. It will take some time for the real jade to heat up in your hand. This method is especially suitable for identifying jade with the same shape and size. Scratch test: Jade is very hard and can cut glass and even metal. Nephrite, on the other hand, is a bit like Microsoft, so an incorrect test method may also destroy a real nephrite. In addition, even if the tested jade can cut glass or steel plate, it may only be some particularly hard imitation jade, such as various green jade, prehnite and so on. Find a blunt pair of scissors, gently press down on the jade, and then make a small mark. Scratches should be scratched as far as possible at the bottom of the jade to avoid being too obvious. If the surface of jade is elegant, you can't use this method, otherwise it will easily damage jade. If the scratch you draw is white, rub it gently (white powder may just be metal powder on scissors) to see if there is any scratch. If there is, then this jade is unlikely to be real. Density test: calculate the density. Jadeite and nephrite have a high density (Jadeite 3.3, nephrite 2.95). Density is calculated by dividing the weight (grams) by the volume (cubic centimeters). Grab the jade with a crocodile clip. If the spring scale you bought doesn't have a crocodile clip, find a thin thread, rubber band or hair band to tie the jade. Lift the top of the spring scale and measure the gravity of the jade. Record gravity. If you want to use a spring scale in grams, the gravity calculated in this way is dyne. Gently immerse the jade in the water and record its gravity in the water. The alligator clip can touch the water surface without affecting the weight measurement. If you are still not at ease, you can change it into something like the rubber band mentioned above and try it again. However, since this test is based on the gravity difference measured twice, whether you use thin lines, rubber bands or hair bands, their gravity will cancel each other out in the final calculation of gravity difference, so it will not affect the calculation result. Calculate the volume of jadeite. Divide the value obtained by weighing in the air by 1000 (if there is a calculator, for the sake of accuracy, it is still divided by 98 1), then divide the value obtained by weighing in the water by 1000 (or 98 1), and subtract the previous result from the latter result. In this way, the weight of jade in air is subtracted from the apparent weight in water, and the volume of jade (buoyancy =pVG) is obtained. 14 & lt； fontcolor="#333333