Mineralogy and Geochemistry of Gems Edited by Panagiotis Voudouris, Stefanos Karampelas, Vasilios Melfos...Melfos and Ian Graham Printed Edition of the Special Issue Published in Minerals www.mdpi.com/journal/minerals...com/journal/minerals Mineralogy and Geochemistry of Gems Mineralogy and Geochemistry of Gems Special Issue...Panagiotis Voudouris National and Kapodistrian University of Athens Greece Stefanos Karampelas Vasilios...University of Gemstones (DANAT) Thessaloniki Bahrain Greece Ian Graham The University of New South Wales Australia