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NOTES AND NEW TECHNIQUES - Amethyst from Four Peaks, Arizona - A report on the geology, mining, and gemological properties of amethyst from the Four Peaks mine, the most important commercial source of amethyst in the United States
Gems and gemology , 2004
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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FEATURE ARTICLE - Classifying Emerald Clarity Enhancement at the GIA Gem Trade Laboratory
Gems and gemology , 1999
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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NOTES AND NEW TECHNIQUES - New Filling Material for Diamonds from Oved Diamond Company: A Preliminary Study - A first look at the properties and durability characteristics of diamonds filled with the new XL-21 glass formulation
Gems and gemology , 2000
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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SPECIAL SESSION - Observations on GE-Processed Diamonds: A Photographic Record
Gems and gemology , 1999
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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NOTES AND NEW TECHNIQUES - A New Lasering Technique for Diamond - Because it usually lacks a surface-reaching drill hole, this new lasering procedure can be difficult to detect
Gems and gemology , 2000
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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NOTES AND NEW TECHNIQUES - A New Method for Imitating Asterism - A new polishing process is being used to create the appearance of asterism in gems that have seldom if ever shown this phenomenon previously
Gems and gemology , 2001
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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FEATURE ARTICLES - Hydrothermal Synthetic Red Beryl from the Institute of Crystallography, Moscow - Grown to mimic the beautiful red beryl from Utah, this synthetic can be identified by its internal growth zoning, chemistry, and spectral features
Gems and gemology , 2001
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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Photomicrography for Gemologists - Reviews the fundamentals of gemological photomicrography and introduces new techniques, advances, and discoveries in the field
Gems and gemology , 2003
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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A Gemological Pioneer: Dr. Edward J. Gübelin - Examines the prolific career and groundbreaking contributions of Swiss gemologist Dr. Edward J. Gübelin (1913-2005)
Gems and gemology , 2005
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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Russian Synthetic Pink Quartz
Gems and gemology , 1998
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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Gemological Investigation of a New Type of Russian Hydrothermal Synthetic Emerald
Gems and gemology , 1996
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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Opal from Shewa Province, Ethiopia
Gems and gemology , 1996
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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NOTES AND NEW TECHNIQUES - Barite Inclusions in Fluorite
Gems and gemology , 1998
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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Mt. Mica: A Renaissance in Maine's Gem Tourmaline Production - This historic deposit is once again producing fine tourmalines, with both the mining area and the gems examined in this report
Gems and gemology , 2005
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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Yellow Mn-rich Tourmaline from the Canary Mining Area, Zambia - Explores the vivid "canary" yellow elbaite from the Lundazi District of eastern Zambia, the most important source of this tourmaline
Gems and gemology , 2007
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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FEATURE ARTICLES - The Identification of Zachery-Treated Turquoise
Gems and gemology , 1999
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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RAPID COMMUNICATIONS - Solution-Generated Pink Color Surrounding Growth Tubes and Cracks in Blue to Blue-Green Copper-Bearing Tourmalines from Mozambique
Gems and gemology , 2009
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft