How do you know if a diamond is real or fake?

There are several ways to determine if a diamond is real or fake. Here are a few methods:

  1. The Fog Test: Hold the diamond and breathe on it like you would a mirror. If the diamond is real, the fog from your breath should clear up quickly. If it's fake, the fog will stick to the surface for a few seconds.

  2. The Water Test: Drop the diamond into a glass of water. If it sinks to the bottom, it's likely a real diamond because diamonds have high density. If it floats, it's probably fake.

  3. The Heat Test: Hold the diamond with a pair of tweezers and heat it with a lighter for about 30 seconds. Then, drop the diamond into a cup of cold water. If it shatters, it was likely a fake diamond because diamonds are highly heat-resistant.

  4. The Scratch Test: Try scratching the diamond with a piece of sandpaper or a sharp object. If it scratches easily, it's not a real diamond because diamonds are one of the hardest materials in the world and can only be scratched by other diamonds.

  5. The UV Light Test: Shine a UV light on the diamond. Most diamonds will fluoresce blue under UV light. If it doesn't fluoresce, it could be a fake diamond.

It's important to note that some of these tests can damage certain types of diamond simulants, such as moissanite or cubic zirconia. Therefore, it's best to have your diamond evaluated by a professional gemologist if you're unsure about its authenticity.