The quarterly journal of the gemological institute of america
EDITORIAL
The World’s Biggest Diamonds: Windows into the Earth’s Deep Mantle
Duncan Pay, Editor-in-Chief
An overview of the Winter 2017 Gems & Gemology content.
Articles (6)
Gem Virtuosos: The Drehers and Their Extraordinary Carvings
A look at the artistic heritage of the Drehers, an influential family of gem carvers in Idar-Oberstein, Germany.
The Very Deep Origin of the World’s Biggest Diamonds
Explores an exceptional family of diamonds, referred to as “CLIPPIR” (Cullinan-like, Large, Inclusion-Poor, Pure, Irregular, and Resorbed), that formed in a superdeep environment.
Akoya Cultured Pearl Farming in Eastern Australia
Characterizes the akoya cultured pearls produced on the eastern shoreline of Australia using native Pinctada imbricata fucata mollusks.
Accurate Reporting of Key Trace Elements in Ruby and Sapphire Using Matrix-Matched Standards
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.
Real-Time Microradiography of Pearls: A Comparison Between Detectors
Compares the image quality provided by real-time microradiographic imaging (RTX) units fitted with two different detectors: an image intensifier (II) and a flat panel detector (FPD).
Chart: Inclusions in Natural, Synthetic, and Treated Ruby
Provides a visual guide to the internal features of natural, synthetic, and treated rubies.
Regular Features
Gem News International
Global coverage of gem sources, notable new gem materials, and recent industry developments.
THE DR. EDWARD J. GÜBELIN
MOST VALUABLE ARTICLE AWARD
Jaipur, India: The Global Gem and Jewelry Power of the Pink City
Andrew Lucas, Nirupa Bhatt,
Manoj Singhania, Kashish
Sachdeva, Tao Hsu, and Pedro
Padua
An Introduction to Photoluminescence Spectroscopy for Diamond and Its Applications in Gemology
Sally Eaton-Magaña and
Christopher M. Breeding
Chart: Inclusions in Natural, Synthetic, and Treated Emerald
Nathan D. Renfro, John I.
Koivula, Jonathan Muyal,
Shane F. McClure, Kevin
Schumacher, and James E.
Shigley
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