Alluvial Sapphires from Montana: Inclusions, Geochemistry, and Indications of a Metasomatic Origin
Microscopic and chemical analysis may provide clues to the original source of Montana’s alluvial sapphires and help distinguish them from sapphires with overlapping properties.
Splendor in the Outback: A Visit to Australia’s Opal Fields
Documents a trip to the renowned opal fields of Lightning Ridge, Koroit, Yowah, and Quilpie.
Colombian Trapiche Emeralds: Recent Advances in Understanding Their Formation
Proposes a model for trapiche emerald formation based on petrographic, spectroscopic, and chemical examination.
Rubies and Sapphires from Snezhnoe, Tajikistan
This large marble-hosted occurrence in the Pamir Mountains is a potentially productive source of corundum, including ruby with a bright red color reminiscent of “pigeon’s blood” Burmese rubies.
Blue Spinel from the Luc Yen District of Vietnam
Offers geological context and gemological characterization of this increasingly popular vivid blue spinel from northeast Vietnam.
The Hidden Beauty of Amber: New Light on an Old Subject
The surprising inner world of inorganic inclusions in amber is explored through the use of polarized light and microscopic techniques.
Abstracts; Summer 2010
This article, from the Summer 2010 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.
Abstracts; Spring 2010
This article, from the Spring 2010 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.
CVD Synthetic Diamonds from Gemesis Corp
An examination of the gemological and spectroscopic properties of CVD synthetic diamonds from Gemesis Corp.
Petrochemical Characteristics and Genesic Significance of Luodian Jade from Guizhou
Luodian jade is a newly discovered nephrite variety in 2009 at the Luodian county of Guizhou province, China.