The quarterly journal of the gemological institute of america
EDITORIAL
Dive Into Summer: Yellow and Orange Diamonds, New Identification Techniques, and the Chronicles of Chivor
Duncan Pay, Editor-in-Chief
An overview of the Summer 2020 Gems & Gemology content.
Articles (5)
Naturally Colored Yellow and Orange Gem Diamonds: The Nitrogen FactorPresents the four major groups of defects responsible for the color in nearly all yellow and orange diamonds.
Presents the four major groups of defects responsible for the color in nearly all yellow and orange diamonds.
Rubies and Sapphires from Snezhnoe, Tajikistan
Researchers from De Beers Group Technology present a technique that expands on the surface luminescence used in the DiamondView instrument to provide additional imaging information and quickly distinguish colorless or near-colorless natural diamond from laboratory-grown diamond.
History of the Chivor Emerald Mine, Part II (1924–1970): Between Insolvency and Viability
Chronicles developments at the Chivor emerald mine in Colombia between 1924 and 1970, based on archival records.
Optical Whitening and Brightening of Pearls: A Fluorescence Spectroscopy Study
Presents a study that suggests optically brightened pearls can be consistently separated from non-brightened pearls using fluorescence spectroscopy.
Hydrogen and Oxygen Stable Isotope Ratios of Dolomite-Related Nephrite: Relevance for Its Geographic Origin and Geological Significance
Examines the effectiveness of hydrogen and oxygen isotopes in discriminating dolomite-related nephrites from the four most important occurrences worldwide.
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 Awards
Geographic Origin Determination of Blue Sapphire
Aaron Palke, Sudarat Saeseaw, Nathan Renfro, Ziyin Sun, and Shane McClure
Decade of Ruby from Mozambique: A Review
Wim Vertriest and Sudarat Saeseaw
Gemstones in the Era of the Taj Mahal and the Mughals
Dona Mary Dirlam, Chris L. Rogers, and Robert Weldon
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