Cubic zirconia is almost the same as diamond. The best way to distinguish between diamonds is that diamonds are lipophilic and water-repellent, while cubic zirconia is the opposite.
The specific method is to draw lines with oily strokes. Intermittent lines are cubic zirconia, smooth ones are diamonds, and one more. It is to use a thermal conductivity meter to detect,
adjust the sensitivity and then detect, distinguish by sound