Look at the lines. Diamond cutting is usually very standard. If there is no light energy passing through, when the diamond sample is placed face down on a piece of paper with black lines, the black lines on the paper are invisible.

2. Motion recognition

Breathing into the diamond, if the water vapor on the surface dissipates quickly, there is a fresh feeling, that is the real diamond; On the contrary, the water vapor in the sample disappears slowly, which is an imitation of diamond.

3. Instrument marking

Thermal conductivity meter is a very common method to identify the authenticity of diamonds. If the instrument displays a red area and makes a sound when it is used to detect diamonds, it is likely to be a real diamond.