Stefan Müller is a Geoscientist and Gemologist who has worked as a mineralogist for the German Gem Lab since 2016. Currently, they are also pursuing a PhD focused on the HPHT treatment of natural and synthetic diamonds. In addition to their role at the German Gem Lab, Stefan serves as an Expert for Gems & Jewellery at Eppli, starting in 2024. Previously, they worked as a Gem Educator and Research Scientist at the Deutsche Gemmologische Gesellschaft e.V. from 2014 to 2016. Stefan is also undertaking a Master of Science in Geology/Earth Science at Johannes Gutenberg-Universität Mainz.
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