Mainly depends on the formal quality inspection certificate of jewelry and jade, which must be a nationally recognized testing institution. Any of the three marks "CMA", "CAL" and "cncal" must be printed on the inspection certificate.

1, "CMA" consists of national or provincial metrological certification and accreditation institutions and accredited metrological certification units.

2. "CAL" is a nationally recognized testing institution.

3. "CNACL" has passed the testing organization approved by China Laboratory.

According to these, we can basically judge the authenticity. Gold is fine as long as it is a regular store, but the gold content is insufficient.

The following places in Chengdu can be identified:

Chengdu Product Quality Supervision and Inspection Institute No.9 Yongfeng Road, Yiguanmiao, Chengdu Tel: 028-5 180554

Chengdu Gold and Silver Jewelry Quality Supervision and Inspection Station Dongsan Road, Erxian Bridge, Chengdu 1 Tel: 028-33347 12-45 12.

No.2 Dongmen Street, Chengdu, No.1 Jewelry and Jade Testing Center of Sichuan Bureau of Quality and Technical Supervision Tel: 028-6249 185

The landlord can call for advice. Some people say that bigger banks can also identify them. I don't know if this is true or not. I hope to help the landlord.