Feature articles from this issue:

• A Decade of Ruby from Mozambique: A Review by Wim Vertriest and Sudarat Saeseaw
• Madagascar Sapphire: Low-Temperature Heat Treatment Experiments by E. Billie Hughes and Rosey Perkins
• Black Nephrite Jade from Guangxi, Southern China by Qian Zhong, Zongting Liao, Lijian Qi, and Zhengyu Zhou
• Evidence of Rotation in Flame-Structure Pearls from Bivalves of the Tridacnidae Family by Jean-Pierre Gauthier, Jacques Fereire, and Thanh Nhan Bui
• A Pearl Identification Challenge by Nicholas Sturman, Laura M. Otter, Artitaya Homkrajae, Areeya Manustrong, Nanthaporn Nilpetploy, Kwanreun Lawanwong, Promlikit Kessrapong, Klaus Peter Jochum, Brigitte Stoll, Herman Götz, and Dorrit E. Jacob
• Inclusions in Natural, Treated, Synthetic, and Imitation Opal by Nathan D. Renfro, John I. Koivula, Jonathan Muyal, Shane F. McClure, Kevin Schumacher, and James E. Shigley

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