The quarterly journal of the gemological institute of america
EDITORIAL
Looking Ahead to 2014
By Duncan Pay, Editor-in-Chief
G&G recognizes the innovations and milestones of 2013 as we move into our 80th year of publication.
Articles (4)
Gemological Characteristics of Coated Jadeite Jade
Analyzes the effects of coating on green jadeite specimens using DiamondView imaging, microscopy, spectroscopy, and Raman spectrophotometry.
Recent Advances in Understanding the Geology of Diamonds
Examines the last two decades’ advances in analyzing and understanding the formation of natural diamonds, and their relation to the earth’s formation.
Update on Gemstone Mining in Luc Yen, Vietnam
Explores the emergence of the Luc Yen area as a producer of corundum, spinel, tourmaline, and other colored stones.
Blue Sapphires from the Baw Mar Mine in Mogok
Reports on the microscopic, chemical, and spectroscopic features that differentiate the high-quality Baw Mar sapphire from “classic” gem-quality Burmese sapphire.
A Pearl Identification Challenge
Two pearls presented a unique challenge, as testing at three different gemological laboratories could not conclusively identify them as natural or cultured, determine a freshwater or saltwater growth environment, or specify the producing mollusk.
Inclusions in Natural, Treated, Synthetic, and Imitation Opal
Provides a visual guide to the internal features of natural, treated, synthetic, and imitation opal.
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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