1. Direct light from the front, stick the flashlight 90 degrees on the jade surface, move the flashlight slowly, check the aperture size, and judge the light transmittance inside the jade, which is an important purpose of making positive light.

2. Look at the cracks in the jade. The internal cracks of jade are irradiated, and the dark reaction or light change reaction with uneven refraction of the internal light source of jade is observed by translating the flashlight light source. Look at the internal structure and grain of jade. When the jade is illuminated at a 45-degree angle, the internal structure and stone grain direction of the jade can be clearly observed.

3. You can also check the flaws of real jade and fake jade. Take the jade to a bright place and observe it under the lamp. Real jade has cracks, asbestos and other defects, while fake jade has no defects. It's clean and the background color is white. Touch your hand. How to treat true and false jadeite? You can also touch real jade and fake jade. Put the jade in your palm and touch it.