If that's the case, let me say something. If you are not an expert, it is difficult for you to tell whether a diamond ring is real or not. You must go to the nearest testing center of the Federation of Industry and Commerce to make a certificate and make two copies, one is diamond and the other is metal.
There is no standard for the height of diamond ring holder. The imitation drill may be a little higher than the real drill, about 0.3MM, which is invisible to the naked eye. Besides, when we do jewelry design, we often design a higher ring holder, which looks more noble. Some customers also said that they were afraid of being too high, afraid of being knocked out, and deliberately made it lower.
The above is my opinion, I hope I can help you. If it helps, please choose my best answer, and I will continue to answer your follow-up questions.