Verified answer

scratch it with a nail and bite it a

well diamonds are made in such a manner that light is totally internally reflected. basically it acts like a mirror. so when you look through a diamond it will act like a mirror not glass. plus there is a machine to check if its real, so go to the nearest jeweler.

good luck

It's simple. Take a knife and try to scratch it. A real diamond won't get scratched. How much did you pay for it?