How to Tell if a Diamond is Real with a Flashlight

If you’ve recently acquired a diamond, you’re probably wondering if it’s real or fake. While diamonds are known to be the hardest material on earth, they can still be easily replicated by synthetic materials. Don’t fret! This article will teach you how to tell if a diamond is real with just a flashlight.

Step 1: Inspect the Diamond

The first thing you should do is inspect the diamond. Use a magnifying glass and check for any imperfections or inclusions. Real diamonds have inclusions that are formed naturally during their creation process. If the diamond appears too perfect, then it may be fake. Look for any bubbles, scratches, or other defects that may indicate that it is not a real diamond.

Step 2: Conduct the Fog Test

Take the diamond and breathe on it like you would a mirror. If the diamond fogs up, then it’s most likely a fake. Real diamonds disperse heat quickly, so the fog will not stick to the diamond’s surface for more than a few seconds.

Step 3: Shine a Light Through the Diamond

Shining a light through the diamond is an effective way to determine if it is real or fake. Take a flashlight and shine it through the diamond. If the diamond is real, then the light should refract and reflect within the diamond. If it’s fake, then the light will pass straight through the stone. However, it’s essential to note that this test may not be 100% reliable, as some synthetic diamonds can refract light just like a real diamond.

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Step 4: Check the Diamond’s Weight

A real diamond will weigh more than a synthetic one. If you have a diamond that is the same size as a synthetic one, it should weigh more. If it doesn’t, then it’s most likely a fake.

Step 5: Conduct the Heat Test

This test is not recommended for people who aren’t professionals because it can damage the diamond. However, if you have a professional to help you out, then this test can be effective. Take a small metal tweezers and hold the diamond over a lighter for a few seconds. Immediately after, drop the diamond in a glass of cold water. If the diamond is real, it will not shatter or break due to the heat shock.


Now that you know how to tell if a diamond is real with a flashlight, you can easily determine whether the diamond you have is genuine or not. While these tests may not be 100% reliable, they can provide you with a good indication of whether the diamond is real or fake. If you’re still unsure about your diamond’s authenticity, it’s best to take it to a professional for further inspection.