Feature articles from this issue:

• A Look at Diamonds and Diamond Mining in Guyana by Roy Bassoo and Kenneth Befus 

• The Shape of Ekanite by Lutz Nasdala, K.A. Geeth Sameera, G.W.A. Rohan Fernando, Manfred Wildner, Chutimun Chanmuang N., Gerlinde Habler, Annalena Erlacher, and Radek Škoda

• A Gemological and Spectroscopic Study with Mobile Instruments of “Emeralds” from the Coronation Crown of Napoleon III by Stefanos Karampelas, Eloïse Gaillou, Annabelle Herreweghe, Farida Maouche, Ugo Hennebois, Sophie Leblan, Bérengère Meslin Sainte Beuve, Michel Lechartier, Didier Nectoux, and Aurélien Delaunay

• Characteristics of Newly Discovered Amber from Phu Quoc, Vietnam by Le Ngoc Nang, Pham Trung Hieu, Lam Vinh Phat, Pham Minh Tien, Ho Nguyen Tri Man, and Ha Thuy Hang

• Natural Radioactivity in Select Serpentite-Related Nephrite Samples: A Comparison with Dolomite-Related Nephrite by Dariusz Malczewski, Michał Sachanbiński, and Maria Dziurowicz

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SKU: 4302203