What is a real diamond?

[echoart]

How can I tell if I have a real diamond in the rough? Will crystals cut glass as well as a diamond?

 

[Hest88]

There are ways to test, some easy, some requiring complicated equipment, but if you know nothing about diamonds the best way is to bring it into an appraiser.

 

[mike04456]

One easy, though not definitive way: Drop it into a glass of water, and slather some butter/margarine on your finger. Poke your finger into the water and touch the crystal. If it sticks to your finger and you can lift it out, it may be a diamond. If not, it's probably something else.