Accurate Reporting of Key Trace Elements in Ruby and Sapphire Using Matrix-Matched Standards
Jennifer Stone-Sundberg, Timothy Thomas, Ziyin Sun, Yunbin Guan, Zachary Cole, Randy Equall, and John L. Emmett, January 26, 2018
Presents a group of corundum standards developed by GIA to improve the accuracy and efficiency of its laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) instruments.
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Gem Virtuosos: The Drehers and Their Extraordinary Carvings
Robert Weldon, Cathleen Jonathan, and Rose Tozer, January 26, 2018
A look at the artistic heritage of the Drehers, an influential family of gem carvers in Idar-Oberstein, Germany.
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Photoluminescence Spectra of Emeralds from Colombia, Afghanistan and Zambia
D. Brian Thompson, Christian J. Bayens, Matthew B. Morgan, Taylor J. Myrick, and Nealey E. Sims, November 8, 2017
Compares PL spectroscopy data of 48 emerald samples from three countries to evaluate the usefulness of the technique in geographic origin determination.
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Characterisation of Mg and Fe Contents in Nephrite Using Raman Spectroscopy
Xiaoyan Feng, Yong Zhang, Taijin Lu, and Hui Zhang, August 7, 2017
Evaluates the usefulness of Raman spectroscopy in distinguishing the colour varieties of nephrite based on the relative ratio of Mg to Fe concentration.
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Origin Determination of Dolomite-Related White Nephrite through Iterative-Binary Linear Discriminant Analysis
Zemin Luo, November 22, 2015
A technique for origin identification based on statistical analysis and LA-ICP-MS spectrometry.
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A Preliminary Study on the Separation of Natural and Synthetic Emeralds Using Vibrational Spectroscopy
Le Thi-Thu Huong, Wolfgang Hofmeister, Tobias Häger, Stefanos Karampelas, and Nguyen Duc-Trung Kien, January 30, 2015
Reports preliminary findings—based on FTIR and Raman spectrometry of more than 300 samples—on distinguishing natural and synthetic emeralds using vibrational spectroscopy.
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Book Review: From a Snowflake to an Iceberg: The McFerrin Collection
Dorothy McFerrin, publ. by the McFerrin Foundation, College Station, Texas, 2013, US $125, October 19, 2013
By Dorothy McFerrin, publ. by the McFerrin Foundation, College Station, Texas, 2013, US $125 (£74)
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Useful Visual Clue Indicating Corundum Heat Treatment
John I. Koivula, October 19, 2013
A demonstration of the conversion of limonitic residues to hematite in surface-reaching.
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Optimising Face-Up Appearance in Coloured Gemstone Faceting
Al Gilbertson, July 24, 2013
How contrast patterns can increase perceived brightness and optimise a gemstone's appearance.
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Fluorescence produced by optical defects in diamond: measurement, characterisation and challenges
Yun Luo, July 24, 2013
How variations in UV lamp output can affect observed fluorescence colour and intensity.
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