China National Light Industry Federation Gemstone Supervision and Testing Center Shanghai Testing Station No.6, Lane 365, Xinhua Road, Shanghai 021-63220033-310 200052

Siping road 1239 Tongji University Gemstone Testing Center 02 1-6598382 Fax: 021-65981217.

Shanghai East China University of Science and Technology Gem Testing Center

Shanghai Zhongbaobao Jade Identification Center No.242 Wuyi Road, Shanghai 02 1-52389058 200050

No.418, Zhenda Road, Shanghai Central Laboratory, Ministry of Geology and Mineral Resources, 200436 T:5668 1084.

Bao Zhong Gem Appraisal Center T: 62 168627 Donghua Famous Diamond Jade Museum, No.61Lishui Road, Zhenbao Yinlou, No.789 Sichuan North Road

2/F, Huabao Building, No.59 Chang Road, Yuyuan Jewelry and Jade Inspection Station, 200010t: 631785-8015.

National Gold and Silver Products Quality Supervision and Inspection Center (Shanghai)