Feature articles from this issue:

• Analytical Techniques in Gemology: A Historical Overview by James E. Shigley

• Application of UV-Vis-NIR Spectroscopy to Gemology by Shiyun Jin, Nathan D. Renfro, Aaron C. Palke, Troy Ardon, and Artitaya Homkrajae

• Infrared Spectroscopy and Its Use in Gemology by Christopher M. Breeding and Nicole J. Ahline

• Shining a Light on Gemstone Properties: An Exploration of Photoluminescence Spectroscopy by Sally Eaton-Magaña, Daniel C. Jones, Rachelle B. Turnier, and Christopher M. Breeding

• Raman Spectroscopy and X-Ray Diffraction: Phase Identification of Gem Minerals and Other Species by Shiyun Jin and Evan M. Smith

• Chemical Analysis in the Gemological Laboratory: XRF and LA-ICP-MS by Ziyin Sun, Michael Jollands, and Aaron C. Palke

• Glowing Gems: Fluorescence and Phosphorescence of Diamonds, Colored Stones, and Pearls by Ulrika F.S. D’Haenens-Johansson, Sally Eaton-Magaña, W. Henry Towbin, and Elina Myagkaya

• Applications of X-Ray Radiography and X-Ray Computed Microtomography in Gemology by Chunhui Zhou and W. Henry Towbin

• Metrology at GIA by David P. Nelson and Ilene M. Reinitz

• Analysis of Gemstones at GIA Laboratories by Nicole J. Ahline and Jessa Rizzo

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