Cause of Color in Yellow Sapphire, Plus Characterization of Oregon Sunstone, Ukrainian Beryl, and British Columbian Iolite
Duncan Pay, November 3, 2023
An overview of the Fall 2023 Gems & Gemology content.
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Diamondiferous Mantle Eclogite: Diamond Surface Features Reveal a Multistage Geologic History
Matthew F. Hardman and Mei Yan Lai, November 3, 2023
Reports on the analysis of a mantle eclogite xenolith with a partially exposed octahedral diamond.
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Iolite from the Thor-Odin Dome, British Columbia, Canada: Geology, Chemical Composition, Inclusions, and Cause of Chatoyancy
Philippe M. Belley, November 3, 2023
Reports on the geological setting and gemological properties of violet-blue gem cordierite from new deposits located in British Columbia.
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Article
Summer 2023 G&G Available Now
Erica Zaidman, August 4, 2023
An overview of the Summer 2023 Gems & Gemology content.
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Corundum Inclusions in Gem Diamond
Garrett McElhenny, Michael Turner, and Christopher M. Breeding, July 22, 2020
Rare chromium-rich corundum inclusions in a natural gem diamond provide a window into the deep earth.
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Gems Formed in Metamorphic Rocks
Aaron C. Palke and James E. Shigley, August 4, 2023
Gemstones formed in metamorphic environments offer insights into the earth’s history and the evolution of tectonic activity that led to their formation.
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Natural Pipi Pearls from Tahiti
Olivier Segura, Emmanuel Fritsch, and Djamel Touati, April 30, 2014
An overview of natural "pipi" pearls from French Polynesia.
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Peridot from the Central Highlands of Vietnam: Properties, Origin, and Formation
Nguyen Thi Minh Thuyet, Christoph Hauzenberger, Nguyen Ngoc Khoi, Cong Thi Diep, Chu Van Lam, Nguyen Thi Minh, Nguyen Hoang, and Tobias Häger, November 7, 2016
Analyzes the gemological and geochemical characteristics of peridot from the Gia Lai province alongside specimens from other localities to gain insight into its formation.
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Gemological Characterization of Peridot from Pyaung-Gaung in Mogok, Myanmar
Montira Seneewong-Na-Ayutthaya, Wassana Chongraktrakul, and Tasnara Sripoonjan, January 28, 2022
Examines the mining and the internal, spectroscopic, and chemical features of peridot from this deposit, which possesses a rich olive green color and is available in large sizes.
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Plastic Deformation: How and Why Are Most Diamonds Slightly Distorted?
Evan M. Smith, May 23, 2023
A look at plastic deformation, one of the most prevalent features in natural diamond.
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