1, Beijing Zhong Da Jewelry Appraisal Center. Address: North of Beijing Cheap House Hotel Chain (Xisi Subway Station), Xisi South Street, Xicheng District, Beijing, Beijing Zhongwei Jewelry and Jade Quality Testing Center. Address: Room 6020, Feng Wan Jewelry, No.59 North Street, Xinjiekou, Xicheng District, Beijing.

2. Gem Appraisal Center of Peking University, Address: Room 3303, New Teaching Building of Peking University, Zhongguancun, Haidian District, Tel: 0 10-62755676. China Geo University Dida Gemstone Inspection Center, Address: No.29 Xueyuan Road, Haidian District, Tel: 82323039.

3. National Jewelry and Jade Quality Supervision and Inspection Center Address: 9th Floor, Tianya Antique City, southwest corner of Huawei Bridge, East Third Ring Road, Chaoyang District, Beijing. Price: about 150 yuan/piece.