The quarterly journal of the gemological institute of america
EDITORIAL
Diamonds from Guyana, Ekanite from Sri Lanka, a New Amber Source in Vietnam, and More...
Duncan Pay, Editor-in-Chief
An overview of the Summer 2022 Gems & Gemology content.
Articles (5)
A Look at Diamonds and Diamond Mining in Guyana
Reports on diamonds from Guyana’s alluvial deposits, including mining history and practices.
The Shape of Ekanite
Discusses the unusual surface characteristics of ekanite from secondary deposits in Sri Lanka.
A Gemological and Spectroscopic Study with Mobile Instruments of “Emeralds” from the Coronation Crown of Napoleon III
An examination of 45 gems from the coronation crown of Napoleon III, using nondestructive mobile spectroscopic and gemological testing methods.
Characteristics of Newly Discovered Amber from Phu Quoc, Vietnam
Offers the first detailed summary of amber from the Vietnamese island of Phu Quoc and a comparison with Baltic, Dominican, and Burmese material.
Natural Radioactivity in Select Serpentinite-Related Nephrite Samples: A Comparison with Dolomite-Related Nephrite
Uses gamma-ray spectrometry to directly measure internal radioactivity in green nephrite from deposits in Poland, Russia, Canada, and New Zealand.
Regular Features
GEM NEWS INTERNATIONAL
Global coverage of gem sources, notable new gem materials, and recent industry developments.
COLORED STONES UNEARTHED
Explores the geological concepts related to colored stone formation.
THE DR. EDWARD J. GÜBELIN
Most Valuable Article Awards
Measurement and Characterization of the Effects of Blue Fluorescence on Diamond Appearance
Yun Luo, David Nelson, Troy Ardon, and Christopher M. Breeding
Internal Structures of Known Pinctada maxima Pearls: Natural Pearls from Wild Marine Mollusks
Artitaya Homkrajae, Areeya Manustrong, Nanthaporn Nilpetploy, Nicholas Sturman, Kwanreun Lawanwong, and Promlikit Kessrapong
Blue Sapphires from Mogok, Myanmar: A Gemological Review
Wasura Soonthorntantikul, Ungkhana Atikarnsakul, and Wim Vertriest
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