7 Ways to Spot Fake Diamonds

7 Ways to Spot Fake Diamonds

Have you ever been suspicious that a loose diamond you bought wasn’t real, or wondered whether your diamond jewelry was genuine? If the stone came with a certificate from the GIA or AGS, you can rest assured that it’s legit. However, if the diamond was a gift or an inheritance and you don’t have the certificate, you’re right to wonder.

If you’ve got a stone you’re in doubt about, here are 7 ways to check its authenticity.

Should you try the scratch test?

People used to think that the “scratch test” was the easiest way to test a diamond. The test is to simply scratch the loose stone against a mirror. The idea is that if the stone is hard enough to scratch the mirror, it’s probably a diamond.

In terms of the Mohs scale, however, this test proves inaccurate. The Mohs scale is a scientific measurement of mineral hardness. Glass is rated a 5.5, and diamonds, the hardest mineral, are a 10. So, genuine diamonds will scratch a mirror. On the other hand, so will quartz (7), moissanite (9.25), and cubic zirconia (8). Moissanite and cubic zirconia engagement rings are almost as hard as their diamond counterparts.

Most well-made synthetic diamonds will seem authentic if you only use the scratch test. Here are some other tests with more reliable results.


If you have a loose stone or piece of diamond jewelry and you are unsure about its authenticity, try some of these home tests. Or, bring the stone to any of Ritani’s retail partners, who are sure to have electricity testing, UV lights, and more tools that can determine the difference between a real diamond and a fake.

Have you ever tested at home or at a jewelry store whether a diamond was real or fake? What were the results? Please share any comparison photos, comments, or additional questions in the comments below!

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