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.