Dr. Ahmadjan Abduriyim

Dr. Ahmadjan Abduriyim is the president of Tokyo Gem Science company and the director of GSTV Gemological Laboratory. He was the former senior research scientist and senior manager of color stones identification service in GIA Tokyo laboratory. Abduriyim received his doctorate in mineralogy from the Division of Earth and Planetary Science at Kyoto University in Japan. He has research worked on the identification of natural, synthetic and treated diamond, color stones and pearls, including working on geographic origin determination of major gemstone and the applications of LA-ICP-MS in gemological field, numerous gemological articles were published in major gemological and geoscience periodicals such as Gems and Gemology and Diamond and Related Materials, Journal of Mineralogical and Petrological Science, Australian Journal of Earth Science, Journal of Raman Spectroscopy, Journal of Crystal Growth. He has received several Dr. Edward J. Gubelin Most Valuable Article Awards and Most Valuable Presentation and Promotion awards in international conferences.