1. First, check which company produced the Zhang Wanfu necklace, and go to the company's website to check the price.

2. Or you can know the price directly by scanning the bar code on the jewelry label with your mobile phone.

3. Look at the unit that issued the jewelry appraisal certificate, and then enter the name of the appraisal unit to search. After entering official website, you can know the authenticity of the jewelry by entering the number on the certificate. .