1. School of Gemology, China University of Geosciences Beijing, 29 Xueyuan Road, Haidian District, Beijing 100083, China
2. Zhongjin Gold Co., Ltd., Beijing 100011, China
3. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
4. The Beijing SHRIMP Center, Chinese Academy of Geological Sciences, Beijing 100037, China