I don't know where the identification of certificates comes from. There should be no appraisal date, but you should compare the scores of ring diamonds. The material of the ring holder (platinum or k gold and gram weight of gold) is different from that marked on the certificate, and the picture is different. The score of the diamond and the material of the ring holder will be engraved on the inner wall of the ring. Don't use a magnifying glass to observe and compare. If one of them doesn't fit, you can consult the Zhou Dasheng store where you bought it.