1, internal. To identify emeralds, we can observe the interior of emeralds with a magnifying glass and a microscope. If the interior is gas or gas-liquid mixture, it is mostly artificial emerald. If different forms are mixed together, it means natural emerald.

2. Fluorescence. When ultraviolet rays shine on emeralds, if emeralds show red fluorescence, it means emeralds are true, and if they are other colors, it means they are false.

3. Thermal conductivity meter. After the jade is laid flat on the table, turn on the switch of the thermal conductivity meter, and at the same time, point the metal contact at the top of the thermal conductivity meter at the surface of the jade. If it is bright for 5 squares, it will be true, otherwise it will be false.