Summer 2020

Feature articles from this issue:

• Naturally Colored Yellow and Orange Gem Diamonds: The Nitrogen Factor by Christopher M. Breeding, Sally Eaton-Magaña, and James E. Shigley
• Separation of Natural from Laboratory-Grown Diamond Using Time-Gated Luminescence Imaging by Colin D. McGuinness, Amber M. Wassell, Peter M.P. Lanigan, and Stephen A. Lynch
• History of the Chivor Emerald Mine, Part II (1924–1970): Between Insolvency and Viability by Karl Schmetzer, Gérard Martayan, and Andrea R. Blake
• Optical Whitening and Brightening of Pearls: A Fluorescence Spectroscopy Study by Chunhui Zhou, Tsung-Han Tsai, Nicholas Sturman, Nanthaporn Nilpetploy, Areeya Manustrong, and Kwanreun Lawanwong
• Hydrogen and Oxygen Stable Isotope Ratios of Dolomite-Related Nephrite: Relevance for Its Geographic Origin and Geological Significance by Kong Gao, Ting Fang, Taijin Lu, Yan Lan, Yong Zhang, Yuanyuan Wang, and Yayun Chang

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