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Fluorescence Produced by Optical Defects in Diamond: Measurement, Characterization, and Challenges

Yun Luo and Christopher M. Breeding

July 24, 2013

How variations in UV lamp output can affect observed fluorescence color and intensity.

Rainbow hematite from Brazil’s Andrade mine.

Iridescence in Metamorphic “Rainbow” Hematite

Xiayang Lin, Peter J. Heaney, and Jeffrey E. Post

May 11, 2018

Analyzes the substructures that cause the intense iridescence observed in “rainbow” hematite from Minas Gerais, Brazil.

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.

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.

Observations on HPHT-Grown Synthetic Diamonds: A Review

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

November 8, 2017

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

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.

Characterization 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 color varieties of nephrite based on the relative ratio of Mg to Fe concentration.

Irradiated 1.06 ct brownish orange HPHT synthetic diamond

Photoluminescence Mapping of Optical Defects in HPHT Synthetic Diamond

Lorne C. Loudin

August 7, 2017

Demonstrates the importance of this method in identifying diamond treatments, based on the analysis of PL maps acquired from a brownish orange HPHT synthetic diamond.

The Identification of Blue Diffusion-Treated Sapphires

Robert E. Kane, Robert C. Kammerling

June 1, 1990

Blue diffusion-treated sapphires are becoming more prevalent than ever before.

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Seeking the Legacy of Australian Sapphire

Tao Hsu

December 14, 2015

Australia has been a prolific supplier of blue sapphire and has made enormous contributions to the global sapphire industry that still shape it today.

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