I bought a diamond ring from Chiba. Why can't I find the certificate information, but it shows that there is no certificate information when I find it? What happened?

This is the NGTC certificate, QY is the abbreviation of Chiba, and 20 1506 10 is the date of issuance of the certificate. The quality of the certificate should be all right. It is impossible to find that the time is near, not included. You can call the National Jewelry and Jade Quality Supervision and Inspection Center for consultation and ask their staff to help you check it, or communicate with the store you bought at that time.