I ordered a loose diamond in Beijing Dacheng, with 32 points, clarity SI 1, color H, cut 3Ex, no fluorescence and GIA certificate. How to distinguish the authenticity of GIA certificate?
GIA's certificates are all numbered and can be searched in official website. There is a website on the certificate. Each diamond has a corresponding GIA certificate, and the number on the rough diamond is the same as the number mantissa of the GIA certificate. Many h colors are too good. Personally, I suggest F color. The purity of SI 1 is visible to the naked eye.