First look at the appraisal certificate. The tricky part is generally on the "surface gold". Gold plating on the surface is generally alloy+gold plating. The coating is very thin, less than a few microns. This kind will fade quickly.

Second, look for the brand. Whether it is the brand of jewelry and gold ornaments operators that can be found online.

Third, pay attention to whether the broadcast channel of TV shopping is in your own province. There are problems in TV shopping in other provinces, and it is very difficult to protect rights.