Secondly, GIA's diamonds are difficult to pass because he has a unique laser number on his waist, which corresponds to the number on GIA's certificate. This is a diamond detection method.
Also, if you buy a diamond of more than one carat, GIA will issue a big certificate (twice the size of a small certificate) with an anatomical map of the orientation, name and size of the inclusion, which further confirms the reliability of this diamond, because no two 4C diamonds in the world are exactly the same as the orientation, size and shape of the inclusion, so each diamond is unique.
Finally, as I said, make a copy of gia certificate.
This won't exist. First of all, the process of forging GIA's certificate is not much simpler than that of RMB, and the cost of forgery is very high, so the protected things can't really be felt.
Imitation diamond: This is impossible. Up to now, diamonds can't be manufactured artificially, otherwise they wouldn't have such a high price. The imitation you are talking about can only be highly imitated zirconia, or zircon for short. This is the most authentic chemical substance at present, but it is completely different from diamond in brightness, hardness and specific gravity. If you are not at ease, you can take it to the old temple gold and Lao Fengxiang for internal inspection. Another possibility is shoddy. In this case, unless he gives you a three-color difference, or the clarity is worse than two grades, he will make a profit. Otherwise, he won't make money from his forgery cost. Why fake it? You need to provide this laser equipment and manpower and material resources!
If we can combine three certificates (diamond laser, certificate number and GIA official website data), we can basically judge that this diamond meets the GIA standard, so don't worry. If you are really worried, do a re-examination! There are tests at the headquarters of famous large jewelers. Also, it is true to find a more assured seller and not lose money on the price.