The quarterly journal of the gemological institute of america
EDITORIAL
Striving for Timeliness and Synergy
By Duncan Pay, Editor-in-Chief
The Fall 2013 issue introduces a new G&G article category—the field report—as well
as online features such as videos and slideshows.
ARTICLES (5)
Agates from Morocco: Gemological Characteristics and Proposed Origin
A report on the chemical and mineralogical analysis of Moroccan agate samples’ solid inclusions.
The Museum of London’S Extraordinary Cheapside Hoard
The history and mysteries behind a treasure of jewels hidden during the 1600s, a window to the past being fully opened to the public for the first time since a chance discovery a century ago.
Three Occurrences of Oregon Sunstone
Chronicles a visit to the high desert of eastern Oregon to examine commercial sources of this natural copper-bearing feldspar.
Useful Visual Clue Indicating Corundum Heat Treatment
Shows the conversion of limonitic residues to hematite in surface-reaching inclusions, a practical indication of heat-treated corundum.
On the Origin of Digit Patterns in Gem Opal
An examination of the finger-like feature mostly found in Ethiopian opal, and proposal for its formation.
Regular Features
GEM NEWS INTERNATIONAL
Global coverage of gem sources, notable new gem materials, and recent industry developments.
GEMOLOGICAL ABSTRACTS
Summaries of important gem and jewelry articles recently published elsewhere.
THE DR. EDWARD J. GÜBELIN
MOST VALUABLE ARTICLE AWARD
CVD Synthetic Diamonds from Gemesis Corp
Wuyi Wang, Ulrika F. S. D’Haenens-Johansson, Paul Johnson, Kyaw Soe Moe, Erica Emerson, Mark Newton, and Thomas M. Moses Wuyi Wang, Ulrika F. S. D’Haenens-Johansson, Paul Johnson, Kyaw Soe Moe, Erica Emerson, Mark Newton, and Thomas M. Moses
Gemstones from Vietnam: An Update
Le Thi-Thu Huong, Tobias Häger, Wolfgang Hofmeister, Christoph Hauzenberger, Dietmar Schwarz, Pham Van Long, Ursula Wehmeister, Nguyen Ngoc Khoi, and Nguy Tuyet Nhung
Emeralds from the Fazenda Bonfim Region, Rio Grande do Norte, Brazil
J. C. (Hanco) Zwaan, Dorrit E. Jacob, Tobias Häger, Mário T. O. Cavalcanti Neto, and Jan Kanis
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