GIA has two kinds of certificates. One is the GIA diamond file, that is, the certificate issued by GIA for diamonds below 1ct, and the other is the GIA diamond classification report, that is, the certificate issued by GIA for diamonds above 1ct (including 1ct).

The two certificates are slightly different. Because the file is a certificate of a smaller diamond, there is no "clarity diagram" of the diamond on the certificate (it reflects the internal situation of the diamond in the form of drawings, including the type and location of the inclusions, which is equivalent to the photo of the diamond under the microscope), so the laser number coded by GIA certificate is engraved on the waist of the diamond to help customers identify the diamond; ; The grading report stipulates that there must be a "clarity sketch", which is unique like a human fingerprint, so the laser coding can be omitted, and this is also to try to keep all aspects of the big diamond perfect, because laser carving may also cause harm to the diamond!

Therefore, it is possible that there is no size for a bare diamond waist above one carat!