1. School of Gemology, China University of Geosciences Beijing, 29 Xueyuan Road, Beijing 100083, China
2. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
3. Taiwan Gemmological Research Center and Laboratory, 6th Floor, No. 92, Section 1, Zhongshan North Road, Zhongshan District, Taipei 10444, Taiwan