There is only one formal and credible appraisal center: Jewelry and Jade Testing and Appraisal Center of Provincial Quality Supervision Bureau, which is an authoritative appraisal institution. Other appraisal institutions can spend money to apply for certificates.
The following is the detailed address of the appraisal center
1. Guangdong Gold and Silver Jewelry Testing Center
No.81Tunnel Bureau Building, Nonglinxia Road, Guangzhou
Tel: 020-8730 1500
2. Guangdong Provincial Technical Supervision Jewellery and Jade Quality Supervision and Inspection Station
No.751Dongfeng East Road, Guangzhou
Tel: 020-87777 1-3298
3. Gem Research and Appraisal Center of Sun Yat-sen University
No.0/35, Xinxiang West Road/KLOC, Guangzhou
Tel: 020-84 186300-2390
4. Gemstone Appraisal Center of Guangzhou Institute of Geology
739 Dongfeng East Road, Guangzhou
Tel: 020-8766880 1