The best way to tell whether a stone is a diamond or moissanite is to use a diamond tester or a moissanite tester. ... Electronic diamond testers, on the other hand, will be able to tell the difference. However, such a device may only be able to show you that the stone is not diamond, but not whether it is moissanite.

The best way to tell whether a stone is a diamond or moissanite is to use a diamond tester or a moissanite tester. ... Electronic diamond testers, on the other hand, will be able to tell the difference. However, such a device may only be able to show you that the stone is not diamond, but not whether it is moissanite.