1, Guangdong Gold and Silver Jewelry Testing Center certificate inquiry, gdtc certificate is reliable. The certificate of Gdtc is reliable, and GDTC is the symbol of Guangdong Gold, Silver and Jewelry Testing Center. Guangdong Gold and Silver Jewelry Testing Center Co., Ltd. is a jewelry product quality testing station approved by China People's Bank and authorized by Guangdong Bureau of Quality and Technical Supervision.

2, it should be true. Pendants inlaid with gold jadeite are generally plated with gold foil on not-so-good jadeite. The market price is two or three hundred, and the jade bracelets and beads are all average. The market price of a string of bracelets 15 yuan, more than 100 yuan.

3. trustworthy. Many certificates in the jewelry industry are issued by this testing center, including Lukfook Jewelry. The color of the certificate is blue, abbreviated as GDTC.

4, silver, the material price is four yuan a gram, the market is generally 925, and the labor cost is two yuan.