How do you tell if a diamond is real?

How do you know if a diamond is real? Does it have colors?

A dimond that is real will cut glass , if not its not real , a dimond is strong enough to cut another dimond
love ,used2beloved

Real diamonds will only reflect white light, NOT COLOURS and they will not scratch.

You can use a U.V. test a.k.a black light. A high persent of diamonds glow blue when put under a black light, a positive identification of medium to strong blue would tell you that you have a real diamond.

A real diamond has at least one flaw. Zyrconiums (fake diamonds) have no flaws, looking perfect.

well a diamond can cut through anything it is the hardest resource that there is!!! But you can try with the reflection of a white light