Ziyin Sun obtained a bachelor’s degree in chemistry at School of Chemistry and Chemical Engineering, Nanjing University, and a master’s degree in analytical chemistry at State Key Laboratory of Analytical Chemistry for Life Science, Nanjing University, China. He also obtained a Graduate Gemologist and Graduate Jeweler degree from the Gemological Institute of America. He is currently working as a Sr. Research Asscociate at Gemological Institute of America in Carlsbad, California. His area of research centers on chemical analysis of various colored stones and minerals by LA-ICP-MS and ED-XRF for country of origin determination and treatment identification. He also focuses on colorimetric analysis of different types of chromophores in various colored stones and minerals using UV-Vis-NIR spectra.