1, look: look at the features, look at the structure, look at the color, and check the defects-jadeite is characterized by "emerald" (commonly known as flying wing), that is, the starlike flash produced by the dissociation of granular, flaky or fibrous spots inside it; The structure is characterized by the interweaving of variegated crystals, and the crystal thickness is an evaluation of jadeite geology. With the help of light or natural light, check whether there are impurities, cracks, etc. In the jade entity, and then combined with other instructions.

2, feel: jade heat transfer is fast, heat dissipation is fast, and it is cold when it is stuck on the face or on the back of the hand for a short time. After polishing, the surface finish is high, and the hand model has obvious slippery feeling.

3. Listen: Listen carefully to the knock between the finished products, and you can roughly judge whether it is jade or not, and what kind of jade it is (whether it has been pickled or treated). Natural jadeite jade pieces, especially those with good texture, will make a crisp and pleasant "steel sound" when struck. Listen, you must have a comparative hearing, or have some experience as the basis, in order to judge the quality of jade in general.

4. Spot: The density of jadeite is 3.34g per cubic centimeter, which is higher than nephrite, dushan jade, Xiuyu, Australian jade, Ma Laiyu (dyed quartzite), sodium jadeite and grape jade. Experienced people can preliminarily judge whether a jade material or jade piece is jadeite by weighing.