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Figure 1. One of GIA’s new LA-ICP-MS corundum calibration standards sets (set number 1); the epoxy disk containing the set is 1.5 inches in diameter. NIST SRM 610 and 612 glass standards are included to account for trace and non-trace elements, such as those found in inclusions, that were not incorporated into the synthetic sapphire crystals grown for standards. Photo by Jennifer Stone-Sundberg.

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.

Gerd Dreher agate lily and Patrick Dreher citrine mouse

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.

Emerald crystals from Colombia, Afghanistan, and Zambia

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.

Observations on HPHT-Grown Synthetic Diamonds: A Review

Sally Eaton-Magaña, James E. Shigley, and Christopher M. Breeding, November 8, 2017

Summarises statistical data and distinctive features of several thousand gem-quality HPHT synthetic diamonds examined by GIA from 2007 through 2016.

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.

Jaipur, India: The Global Gem and Jewellery Power of the Pink City

Andrew Lucas, Nirupa Bhatt, Manoj Singhania, Kashish Sachdeva, Tao Hsu, and Pedro Padua, January 26, 2017

Examines Jaipur’s role as a coloured stone cutting and jewellery manufacturing centre, with profiles of 17 companies and their factory, trading and retail operations.

Fluorescence image of Aurora Butterfly of Peace

An Introduction to Photoluminescence Spectroscopy for Diamond and Its Applications in Gemmology

Sally Eaton-Magaña and Christopher M. Breeding, April 28, 2016

Presents the underlying physics and methodology of this analytical technique, which has become an essential tool in identifying treated and synthetic diamonds.

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.

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.

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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