Feature articles from this issue:

• A Canary in the Ruby Mine: Low-Temperature Heat Treatment Experiments on Burmese Ruby by E. Billie Hughes and Wim Vertiest

• Fluorescence Characteristics of Two Copper Diffused Plagioclase Feldspars: Labradorite and Andesine by Qingchao Zhou, Chengsi Wang, and Andy H. Shen

• Composition and Spectral Characteristics of Porcelain-Treated Turquoise by Liying Huang, Quanli Chen, Yan Li, Zuowei Yin, Fengshun Xu, Xinxin Gao, and Yang Du

• Never Stop Innovating: Gem Artist Chi Huynh by Tao Hsu, Artitaya Homkrajae, and Kevin Schumacher

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SKU: 4302201