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Step 1
The easiest way to tell if a diamond is fake is to simply breathe on it. If the diamond becomes foggy and doesn't clear by the time you stop to look at it, it is a fake. A real diamond will clear up within the second it takes to stop breathing on it and look at it to inspect it. Fake diamonds will often times stay foggy for a few seconds, or longer.
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Step 2
If you're not concerned with causing damage to a fake, you can always rely on the glass test. A real diamond will be able to cut glass without ever causing damage to the diamond. You can scratch a small piece of glass, or even do it on the corner of an old mirror. If the diamond is scratched in any way, it's a fake.
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Step 3
Many people do not realize it, but the reflection colors in diamonds are always only shades of grey. If your diamond reflects different colors, especially a rainbow affect, it is fake.
