A fake diamond is heavier than the real one when they are the same size. In addition, a fake diamond does not have the same brilliance as a real diamond. In time, it becomes duller, contrary to a real diamond, which never loses its brilliance.
A fog test is also a useful method to distinguish the genuine diamond. A fake one doesn’t repel heat immediately unlike the real one.
As a service to our customers, we can also use a diamond tester at our BAUNAT offices to verify if the stone is indeed a diamond.