Feature articles from this issue:

• Color Modification of Spinel by Nickel Diffusion: A New Treatment by Michael Jollands, Abadie Ludlam, Aaron C. Palke, Wim Vertriest, Shiyun Jin, Pamela Cevallos, Sarah Arden, Elina Myagkaya, Ulrika D’Haenens-Johannson, Vararut Weeramongkhonlert, and Ziyin Sun

• Gem-Quality Augite from Dong Nai, Vietnam by Le Ngoc Nang, Lam Vinh Phat, Pham Minh Tien, Pham Trung Hieu, Kenta Kawaguchi, and Pham Minh

• Origins of Color in Brown Mammoth Ivory by Zhaoying Huang, Tao Chen, Jinyu Zheng, Duo Wang, and Xing Xu

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SKU: 9302302