Maybe, but it can be prevented. In fact, at present, most of the more than 30 loose diamonds purchased in the market can issue gia international certificates, and domestic jewelers will default to the gia number of laser engraving (unless customers have special requirements), so this laser number is an important basis to prevent the loose diamonds from being replaced. Then you can directly tell the merchant that your diamond is GIA code when it is set with loose diamonds, and let them expose the code in the gap of the ring claw. After getting the finished diamond ring, check whether the code number is correct with a high-powered mirror and check the authenticity of the code.