How can I be sure the store won't swap my diamond?

How can I be sure the store won’t swap my diamond?

In cases where customers bring their existing diamond jewelry to be reset, certified diamonds typically have a laser inscription on the girdle of every stone, and these numbers must match the certificate exactly. Once the resetting is complete, the store will allow you to view the laser inscription under a loupe to verify that it matches the certificate. Therefore, customers can be confident that their diamonds will definitely not be swapped. 

Alternatively, if the diamond does not have a certificate, it relies on trust; therefore, you should choose a reputable store.