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Gems & Gemology is pleased to make these feature articles available for free as a public service. To view these PDF files, you will need Adobe Acrobat Reader. Entire issues of G&G from 1934 through 1980 may also be downloaded at no charge. Additional free Lab Notes and Gem News International reports are available with the online edition of each issue.
"An Examination of the Napoleon Diamond Necklace" (Winter 2007): Provides a history and gemological characterization of this historic necklace.
"Natural Type Ia Diamond with Green-Yellow Color Due to Ni-Related Defects" (Fall 2007): Provides the first report of nickel-related defects in a type Ia natural diamond with a strong green component.
"Yellowish Green Diopside and Tremolite from Merelani, Tanzania" (Summer 2007): Reports on diopside and tremolite from Merelani with an unusual "mint" green color.
"Polymer-Impregnated Turquoise" (Summer 2007): Examines a turquoise specimen impregnated with a filler that was identified as a UV-hardened polymer.
"Identification and Durability of Lead Glass–Filled Rubies" (Spring 2006): Reviews the characteristics, idenfitication, and durability of rubies treated with high-lead-content glass filler.
"A Foundation for Grading the Overall Cut Quality of Round Brilliant Cut Diamonds" (Fall 2004): The third installment of GIA's research on diamond cut. Describes the authors' use of observation testing and introduces the GIA diamond cut grading system, which provides a single overall cut quality grade for standard round brilliants. The pull-out chart for this article is not available in the PDF version. To obtain this chart—“Examples from the GIA Diamond Cut Grading System”—or your own copy of the Fall 2004 issue, please go to the G&G order page.
"Lab-Grown Colored Diamonds from Chatham Created Gems" (Summer 2004): Shows the identifying characteristics of yellow, blue, green, and pink synthetic diamonds from a new commercial source.
"Pezzottaite from Ambatovita, Madagascar: A New Gem Mineral" (Winter 2003): A look at the history, geology, composition, and properties of this new cesium-rich member of the beryl group.
"G. Robert Crowningshield: A Legendary Gemologist" (Fall 2003): A look at the extraordinary career of G. Robert Crowningshield.
"Beryllium Diffusion of Ruby and Sapphire" (Summer 2003): A comprehensive review of the processes and causes of color involved in the new treatment of corundum with beryllium. The pull-out chart for this article is not available in the PDF version. To obtain this chart—“Visual Clues for Recognizing Beryllium-Diffused Ruby and Sapphire"—or your own copy of the Summer 2003 issue, please go to the G&G order page.
"Photomicrography for Gemologists" (Spring 2003) Reviews the fundamentals of gemological photomicrography and introduces new techniques, advances, and discoveries in the field.
"Rhodizite-Londonite from the Antsongombato Pegmatite, Central Madagascar" (Winter 2002) Describes the history, geology, mining, and gemological characteristics of gem-quality rhodizite-londonite from its only known source.
“The Ultimate Gemologist: A Tribute to Richard T. Liddicoat” (Spring 2002): A look at the career of GIA chairman Richard Liddicoat on his 50th anniversary as Gems & Gemology’s editor-in-chief.
"Liddicoatite Tourmaline from Anjanabonoina, Madagascar" (Spring 2002): Explores the world's primary source of this remarkable calcium-rich lithium tourmaline, named in honor of Richard T. Liddicoat.
“Modeling the Appearance of the Round Brilliant Cut Diamond: An Analysis of Fire, and More About Brilliance” (Fall 2001): GIA’s second major research article on diamond cut.
“Modeling the Appearance of the Round Brilliant Cut Diamond: An Analysis of Brilliance” (Fall 1998): The first article from GIA’s research on diamond cut.
"Gem News: Another Tourmaline Source in Namibia" (Spring 1998): Gem News report on slightly bluish green tourmalines reportedly found near Windhoek, Namibia.
“A Contribution to Understanding the Effect of Blue Fluorescence on the Appearance of Diamonds” (Winter 1997): Addresses the longstanding controversy over how fluorescence affects the color appearance and transparency of gem diamonds.
"Multicolored Bismuth-Bearing Tourmaline from Lundazi, Zambia" (Fall 1997): Reports on a new deposit and documents the unusual composition and other properties of this tourmaline.
"Gem News: [Demantoid Garnets] from Namibia" (Fall 1997): Gem News report on two demantoid garnets from a new locality in Namibia.
“An Update on Filled Diamonds: Identification and Durability” (Fall 1994): Focused on fracture-filling products from three major commercial sources and described practical techniques for identifying them using standard gemological equipment
“Heat Treating the Sapphires of Rock Creek Montana” (Winter 1993): A comprehensive study of the use of heat treatment to change color in sapphire.
"Gamma-Ray Spectroscopy to Measure Radioactivity in Gemstones" (Summer 1992): Reviews the use of this method to detect the type and quantity of radionuclides present in radioactive gemstones.
"Gemstone Irradiation and Radioactivity" (Winter 1988): Reviews the basic characteristics of radiation and radioactivity, sources of radiation in the earth and in the laboratory, the radiation treatment of gemstones in particular, and the detection and measurement of radiation.
“Gem Pegmatites of Minas Gerais, Brazil: Exploration, Occurrence, and Aquamarine Deposits" (Summer 1984): Reviews the exploration, occurrence, and the mining methods for pegmatite gemstones in Minas Gerais, with an emphasis on aquamarine. (Companion articles on Minas Gerais by the author were published in the Spring 1985, Summer 1985, and Spring 1988 issues.)
