The Summer 2009 issue of the Gemological Institute of America's (GIA) Gems & Gemology (G&G) features a look at the journal's first 75 years, as well as the "type" classification system for diamonds and a new tool to screen for copper-bearing tourmaline.
The lead article, Stuart Overlin and Dona Dirlam's "Celebrating 75 Years of Gems & Gemology," chronicles the publication's key contributors, landmark articles and gemological milestones.
"The science of gemology has made remarkable strides since G&G's first issue in 1934," said Editor-in-Chief Alice Keller. "In addition to reviewing the growth of the journal, this article offers a concise history of the developments that have shaped gemology in the 21st century."
Next is "The ‘Type' Classification System of Diamonds and Its Importance in Gemology." Christopher M. Breeding and James Shigley review the diamond type system -- type I, type II and their subdivisions -- which is based on the presence or absence (and configuration) of nitrogen and boron impurities. This property, sometimes identifiable with standard gemological tests, has significant implications for detecting treated and synthetic diamonds.
Paul Merkel and Breeding's "Spectral Differentiation Between Copper and Iron Colorants in Gem Tourmalines" presents a relatively simple means of assessing the presence of copper in gem tourmaline, the key criterion for designating a stone as "Paraíba" or "Paraíba-type." Following this, Shyamala Fernandes and Gagan Choudhary's "Gem-Quality Andalusite from Brazil," documents the properties of this unusual gem material.
Rounding out the Summer issue articles is a Rapid Communication by Ilaria Adamo and coauthors that characterizes peridot from the Italian island of Sardinia. The Lab Notes section features the latest discoveries from the GIA Laboratory, including a rare star peridot, a pink CVD synthetic diamond, and a Fancy black diamond with a deep violet color. Highlights from the Gem News International section include orange kyanite from Tanzania, cultured pearls from Fiji, and zircon mining in Cambodia.
PDF versions of the Summer 2009 issue are available at http://gia.metapress.com. To purchase a print copy or to subscribe to G&G, visit www.gia.edu/_webapps/gg/orderform/, or contact Circulation Coordinator Martha Rivera by email at martha.rivera@gia.edu or by calling +1 (760) 603-4000, ext. 7142.
The lead article, Stuart Overlin and Dona Dirlam's "Celebrating 75 Years of Gems & Gemology," chronicles the publication's key contributors, landmark articles and gemological milestones.
"The science of gemology has made remarkable strides since G&G's first issue in 1934," said Editor-in-Chief Alice Keller. "In addition to reviewing the growth of the journal, this article offers a concise history of the developments that have shaped gemology in the 21st century."
Next is "The ‘Type' Classification System of Diamonds and Its Importance in Gemology." Christopher M. Breeding and James Shigley review the diamond type system -- type I, type II and their subdivisions -- which is based on the presence or absence (and configuration) of nitrogen and boron impurities. This property, sometimes identifiable with standard gemological tests, has significant implications for detecting treated and synthetic diamonds.
Paul Merkel and Breeding's "Spectral Differentiation Between Copper and Iron Colorants in Gem Tourmalines" presents a relatively simple means of assessing the presence of copper in gem tourmaline, the key criterion for designating a stone as "Paraíba" or "Paraíba-type." Following this, Shyamala Fernandes and Gagan Choudhary's "Gem-Quality Andalusite from Brazil," documents the properties of this unusual gem material.
Rounding out the Summer issue articles is a Rapid Communication by Ilaria Adamo and coauthors that characterizes peridot from the Italian island of Sardinia. The Lab Notes section features the latest discoveries from the GIA Laboratory, including a rare star peridot, a pink CVD synthetic diamond, and a Fancy black diamond with a deep violet color. Highlights from the Gem News International section include orange kyanite from Tanzania, cultured pearls from Fiji, and zircon mining in Cambodia.
PDF versions of the Summer 2009 issue are available at http://gia.metapress.com. To purchase a print copy or to subscribe to G&G, visit www.gia.edu/_webapps/gg/orderform/, or contact Circulation Coordinator Martha Rivera by email at martha.rivera@gia.edu or by calling +1 (760) 603-4000, ext. 7142.
04th August 2009