Issues
Winter 2011
Volume 47, Issue 4
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Great Expectations
Jan Iverson
Dyed Purple Hydrophane Opal
Nathan Renfro and Shane F. McClure
Determining Garnet Composition from Magnetic Susceptibility and Other Properties
Donald B. Hoover
GIA’s Symmetry Grading Boundaries For Round Brilliant Cut Diamonds
Ron H. Geurts, Ilene M. Reinitz, Troy Blodgett, and Al M. Gilbertson
A Historic Turquoise Jewelry Set Containing Fossilized Dentine (Odontolite) and Glass
Michael S. Krzemnicki, Franz Herzog, and Wei Zhou
The Radioactive Decay Pattern of Blue Topaz Treated by Neutron Irradiation
Jian Zhang, Taijin Lu, Manjun Wang, and Hua Chen
REGULAR FEATURES
Lab Notes (Featuring: Type IIb Diamond with Long Phosphorescence)
Gem News International (Featuring: Vanadium-Bearing Color-Change Sphene from Pakistan/Afghanistan)
Book Reviews
Gemological Abstracts
Annual Index
Fall 2011
Volume 47, Issue 3
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New Beginnings
Jan Iverson
Ruby and Sapphire from the Tan Huong–Truc Lau Area, Yen Bai Province, Northern Vietnam
Nguyen Ngoc Khoi, Chakkaphan Sutthirat, Duong Anh Tuan, Nguyen Van Nam, Nguyen Thi Minh Thuyet, and Nguy Tuyet Nhung
Infrared Spectroscopy of Natural vs. Synthetic Amethyst: An Update
Stefanos Karampelas, Emmanuel Fritsch, Triantafillia Zorba, and Konstantinos M. Paraskevopoulos
Exploring the Origin and Nature of Luminescent Regions in CVD Synthetic Diamond
Bert Willems, Alexandre Tallaire, and Julien Barjon
Identification of Extraterrestrial Peridot by Trace Elements
Andy H. Shen, John I. Koivula, and James E. Shigley
A History of Diamonds through Philately: The Frank Friedman Collection
Stuart D. Overlin
REGULAR FEATURES
2011 Challenge Winners
Lab Notes (Featuring: Gem-Quality CVD Synthetic Diamonds from Gemesis)
Gem News International (Featuring: Color-Change Garnet from Nandagala, Tanzania)
Book Reviews
Gemological Abstracts
Summer 2011
Volume 47, Issue 2
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GIA Symposium 2011: Advancing the Science and Business of Gems
Kathryn Kimmel and Alice Keller
KEYNOTE ADDRESS
Navigating the Current Economy For Business Growth and Success
Steve Forbes
PHOTOMONTAGE
RESEARCH TRACK
Diamond Identification
Gem Localities and Formation
Colored Stone and Pearl Identification
New Technologies and Instrumentation
POSTER SESSION
Diamond Identification
Gem Localities and Formation
Colored Stone and Pearl Identification
New Technology and Instrumentation
Business Track
FEATURE ARTICLE
Research on Gem Feldspar from the Shigatse Region of Tibet
Ahmadjan Abduriyim, Shane F. McClure, George R. Rossman, Thanong Leelawatanasuk, Richard W. Hughes, Brendan M. Laurs, Ren Lu, Flavie Isatelle, Kenneth Scarratt, Emily V. Dubinsky, Troy R. Douthit, and John L. Emmett
Spring 2011
Volume 47, Issue 1
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The Dr. Edward J. Gübelin Most Valuable Article Award
Demantoid and Topazolite from Antetezambato, Northern Madagascar: Review and New Data
Federico Pezzotta, Ilaria Adamo, and Valeria Diella
The Chinese Red Feldspar Controversy: Chronology of Research Through July 2009
George R. Rossman
UV-Vis-NIR Reflectance Spectroscopy of Natural-Color Saltwater Cultured Pearls from Pinctada Margaritifera
Stefanos Karampelas, Emmanuel Fritsch, Jean-Pierre Gauthier, and Thomas Hainschwang
Brownish Red Zircon from Muling, China
Tao Chen, Hao Ai, Mingxing Yang, Shu Zheng, and Yungui Liu
Aquamarine from the Thuong Xuan District, Thanh Hoa Province, Vietnam
Le Thi-Thu Huong, Wolfgang Hofmeister, Tobias Häger, Nguyen Ngoc Khoi, Nguy Tuyet Nhung, Wilawan Atichat, and Visut Pisutha-Arnond
REGULAR FEATURES
Lab Notes (Featuring: A Very Large Colorless HPHT-Treated Diamond)
Gem News International (Featuring: Trapiche Emerald Imitation)
Book Reviews
Gemological Abstracts
Winter 2010
Volume 46, Issue 4
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A Fond Farewell
Alice S. Keller
Synthetic Gem Materials in the 2000s: A Decade in Review
Nathan Renfro, John I. Koivula, Wuyi Wang, and Gary Roskin
Yellow Scapolite from Ihosy, Madagascar
Margherita Superchi, Federico Pezzotta, Elena Gambini, and Emanuela Castaman
A Microstructural Study of Pietersite from Namibia and China
Kaifan Hu and Peter J. Heaney
Update on Mexifire Synthetic Fire Opal
Rajneesh Bhandari and Gagan Choudhary
A Study of the Gems in a Ciborium from Einsiedeln Abbey
Stefanos Karampelas, Marie Wörle, Katja Hunger, Hanspeter Lanz, Danilo Bersani, and Susy Gübelin
REGULAR FEATURES
Lab Notes (Featuring: Silicon-Vacancy Defect Found in Blue HPHT-Grown Synthetic Diamond)
Gem News International (Featuring: “Neon” Blue-to-Green Cu- and Mn-Bearing Liddicoatite Tourmaline)
Book Reviews
Gemological Abstracts
Annual Index
Fall 2010
Volume 46, Issue 3
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Retrospective of the First Decade of the 2000s: Looking Back as We Move Aheadz
Alice S. Keller
An Era of Sweeping Change in Diamond and Colored Stone Production and Markets
Russell Shor and Robert Weldon
Gem Localities of the 2000s
James E. Shigley, Brendan M. Laurs, A. J. A. (Bram) Janse, Sheryl Elen, and Dona M. Dirlam
Gemstone Enhancement and Its Detection in the 2000s
Shane F. McClure, Robert E. Kane, and Nicholas Sturman
Developments in Gemstone Analysis Techniques and Instrumentation During the First Decade of the 2000s
Christopher M. Breeding, Andy H. Shen, Sally Eaton-Magaña, George R. Rossman, James E. Shigley, and Al Gilbertson
REGULAR FEATURES
Letters
Book Reviews
Gemological Abstracts
Summer 2010
Volume 46, Issue 2
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GIA Symposium 2011: Advances in Gemological Research
Alice S. Keller
The Wittelsbach-Graff and Hope Diamonds: Not Cut from the Same Rough
Eloïse Gaillou, Wuyi Wang, Jeffrey E. Post, John M. King, James E. Butler, Alan T. Collins, and Thomas M. Moses
Play-of-Color Opal from Wegel Tena, Wollo Province, Ethiopia
Benjamin Rondeau, Emmanuel Fritsch, Francesco Mazzero, Jean-Pierre Gauthier, Bénédicte Cenki-Tok, Eyassu Bekele, and Eloïse Gaillou
A New Type of Composite Turquoise
Gagan Choudhary
New Occurrence of Fire Opal from Bemia, Madagascar
Martina Simoni, Franca Caucia, Ilaria Adamo, and Pietro Galinetto
X-ray Computed Microtomography Applied to Pearls: Methodology, Advantages, and Limitations
S. Karampelas, J. Michel, M. Zheng-Cui, J.-O. Schwarz, F. Enzmann, E. Fritsch, L. Leu, and M. S. Krzemnicki
X-ray Computed Microtomography: Distinguishing Natural Pearls from Beaded and Non-Beaded Cultured Pearls
Michael S. Krzemnicki, Sebastian D. Friess, Pascal Chalus, Henry A. Hänni, and Stefanos Karampelas
Hibonite: A New Gem Mineral
Thomas Hainschwang, Franck Notari, Laurent Massi, Thomas Armbruster, Benjamin Rondeau, Emmanuel Fritsch, and Mariko Nagashima
Lab Notes (Featuring: CVD Synthetic Diamond Over One Carat)
Gem News International (Featuring: Tsavorite and Other Green Garnets Reportedly from Afghanistan)
Book Reviews
Gemological Abstracts
Spring 2010
Volume 46, Issue 1
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The Dr. Edward J. Gübelin Most Valuable Article Award
Strongly Colored Pink CVD Lab-Grown Diamonds
Wuyi Wang, Patrick Doering, Joshua Tower, Ren Lu, Sally Eaton-Magaña, Paul Johnson, Erica Emerson, and Thomas M. Moses
Color Alterations in CVD Synthetic Diamond with Heat and UV Exposure: Implications for Color Grading and Identification
Rizwan U. A. Khan, Philip M. Martineau, Bradley L. Cann, Mark E. Newton, Harpreet K. Dhillon, and Daniel J. Twitchen
Possible “Sister” Stones of the Hope Diamond
Scott D. Sucher, Stephen W. Attaway, Nancy L. Attaway, and Jeffrey E. Post
Confocal Micro-Raman Spectroscopy: A Powerful Tool to Identify Natural and Synthetic Emeralds
Le Thi-Thu Huong, Tobias Häger, and Wolfgang Hofmeister
Bastnäsite-(Ce) and Parisite-(Ce) From Mt. Malosa, Malawi
Alessandro Guastoni, David Kondo, and Fabrizio Nestola
Lab Notes (Featuring: Coated and Fracture-Filled Orangy Red Diamond)
Gem News International (Featuring: Diopside from Ihosy, Madagascar)
Letter: Diffraction Gratings on Diamond Surfaces
Book Reviews
Gemological Abstracts
Winter 2009
Volume 45, Issue 4
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Letters: More on the "Fluorescence Cage," and More on Green Amber
Ruby and Sapphire Production and Distribution: A Quarter Century of Change
Russell Shor and Robert Weldon
Cutting Diffraction Gratings to Improve Dispersion (“Fire”) in Diamonds
Al Gilbertson, Benjamin Gudlewski, Mary Johnson, George Maltezos, Axel Scherer, and James Shigley
Chrysoprase and Prase Opal from Haneti, Central Tanzania
James E. Shigley, Brendan M. Laurs, and Nathan D. Renfro
Demantoid from Val Malenco, Italy: Review and Update
Ilaria Adamo, Rosangela Bocchio, Valeria Diella, Alessandro Pavese, Pietro Vignola, Loredana Prosperi, and Valentina Palanza
Lab Notes (Featuring: Uranium Mineral as Inclusions in Turquoise)
Gem News International (Featuring: New Find of Pink-to-Red Tourmaline in Nigeria)
Book Reviews
Gemological Abstracts
2009 Index
Fall 2009
Volume 45, Issue 3
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New Technologies Face Off with New Realities
Brendan M. Laurs
Characterization of “Green Amber” With Infrared and Nuclear Magnetic Resonance Spectroscopy
Ahmadjan Abduriyim, Hideaki Kimura, Yukihiro Yokoyama, Hiroyuki Nakazono, Masao Wakatsuki, Tadashi Shimizu, Masataka Tansho, and Shinobu Ohki
A Crystallographic Analysis of the Tavernier Blue Diamond
Scott D. Sucher
“Fluorescence Cage”: Visual Identification of HPHT-Treated Type I Diamonds
Inga A. Dobrinets and Alexander M. Zaitsev
Update on Ammolite Production from Southern Alberta, Canada
Keith A. Mychaluk
Polymer-Filled Aquamarine
Li Jianjun, Sun Yuan, Hao Wangjiao, Luo Han, Cheng Youfa, Liu Huafeng, Liu Ying, Ye Hong, and Fan Chengxing
Gem-Quality Yellow-Green Haüyne from Oldoinyo Lengai Volcano, Northern Tanzania
Anatoly N. Zaitsev, Olga A. Zaitseva, Alexander K. Buyko, Jörg Keller, Jurgis Klaudius, and Andrei A. Zolotarev
Aquamarine from the Masino-Bregaglia Massif, Central Alps, Italy
Rosangela Bocchio, Ilaria Adamo, and Franca Caucia
Lab Notes (Featuring: A Useful Technique to Identify Negative Crystals in Ruby)
Gem News International (Featuring: Topaz with Unstable Brown Color)
2009 Challenge Winners
Book Reviews
Gemological Abstracts
Summer 2009
Volume 45, Issue 2
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Gems & Gemology: The First 75 Years
Alice S. Keller
Celebrating 75 Years of Gems & Gemology
Stuart Overlin and Dona M. Dirlam
The “Type” Classification System of Diamonds and Its Importance in Gemology
Christopher M. Breeding and James E. Shigley
Spectral Differentiation Between Copper and Iron Colorants in Gem Tourmalines
Paul B. Merkel and Christopher M. Breeding
Gem-Quality Andalusite from Brazil
Shyamala Fernandes and Gagan Choudhary
Characterization of Peridot from Sardinia, Italy
Ilaria Adamo, Rosangela Bocchio, Alessandro Pavese, and Loredana Prosperi
Lab Notes (Featuring: Unconventional Diamond Cuts)
Gem News International (Featuring: Cultured Pearls from Fiji and Colorless Petalite and Pollucite from Laghman, Afghanistan)
Letters
Book Reviews
Gemological Abstracts
Spring 2009
Volume 45, Issue 1
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The Dr. Edward J. Gübelin Most Valuable Article Awards
The French Blue and the Hope: New Data from the Discovery of a Historical Lead Cast
François Farges, Scott Sucher, Herbert Horovitz, and Jean-Marc Fourcault
Gray-to-Blue-to-Violet Hydrogen-Rich Diamonds from the Argyle Mine, Australia
Carolyn H. van der Bogert, Christopher P. Smith, Thomas Hainschwang, and Shane F. McClure
Hackmanite/Sodalite from Myanmar and Afghanistan
David Kondo and Donna Beaton
Solution-Generated Pink Color Surrounding Growth Tubes and Cracks in Blue to Blue-Green Copper-Bearing Tourmalines from Mozambique
John I. Koivula, Kevin Nagle, Andy Hsi-Tien Shen, and Philip Owens
Identification of the Endangered Pink-to-Red Stylaster Corals by Raman Spectroscopy
Stefanos Karampelas, Emmanuel Fritsch, Benjamin Rondeau, Aude Andouche, and Bernard Métivier
Lab Notes (Featuring: Purplish Pink Spinel from Tajikistan—Before and After Cutting)
Gem News International (Featuring: New Play-of-Color Opal from Welo, Ethiopia)
Book Reviews
Gemological Abstracts
Gems & Gemology Challenge
Winter 2008
Volume 44, Issue 4
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Challenges, Changes, and New Directions
Alice S. Keller
Color Grading “D-To-Z” Diamonds at the GIA Laboratory
John M. King, Ron H. Geurts, Al M. Gilbertson, and James E. Shigley
Rubies and Sapphires from Winza, Central Tanzania
D. Schwarz, V. Pardieu, J. M. Saul, K. Schmetzer, B. M. Laurs, G. Giuliani, L. Klemm, A.-K. Malsy, E. Erel, C. Hauzenberger, G. Du Toit, A. E. Fallick, and D. Ohnenstetter
The Wittelsbach Blue
Rudolf Dröschel, Jürgen Evers, and Hans Ottomeyer
Lab Notes (Featuring: HPHT-Treated CVD Synthetic Diamond Submitted for Dossier Grading)
Gem News International (Featuring: Visit to Andesine Mines in Tibet and Inner Mongolia)
Book Reviews
Gemological Abstracts
2008 Annual Index
Fall 2008
Volume 44, Issue 3
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A New Gemological Challenge: Synthetic Diamond Melee
Alice S. Keller
Identification of Melee-Size Synthetic Yellow Diamonds in Jewelry
Hiroshi Kitawaki, Ahmadjan Abduriyim, and Makoto Okano
Aquamarine, Maxixe-Type Beryl, and Hydrothermal Synthetic Blue Beryl: Analysis and Identification
Ilaria Adamo, Alessandro Pavese, Loredana Prosperi, Valeria Diella, David Ajò, G. Diego Gatta, and Christopher P. Smith
A New Type of Synthetic Fire Opal: Mexifire
Gagan Choudhary and Rajneesh Bhandari
The Color Durability of “Chocolate Pearls” by Ballerina Pearl Co.
Garry Du Toit, Andy H. Shen, and Christopher M. Breeding
Gota de Aceite: Nomenclature for the Finest Colombian Emeralds
Ronald Ringsrud
Color Variations and Properties of Johachidolite from Myanmar
Karen M. Chadwick and Christopher M. Breeding
Lab Notes
Gem News International (Featuring: Colorless Forsterite from Tajikistan)
Book Reviews
Gemological Abstracts
Summer 2008
Volume 44, Issue 2
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Characterization of Emeralds from a Historical Deposit: Byrud (Eidsvoll), Norway
Benjamin Rondeau, Emmanuel Fritsch, Jean-Jacques Peucat, Fred Steinar Nordrum, and Lee Groat
The Use of Laser and X-ray Scanning to Create a Model of the Historic Koh-i-Noor Diamond
Scott D. Sucher and Dale P. Carriere
Coated Tanzanite
Shane F. McClure and Andy H. Shen
Coloring of Topaz by Coating and Diffusion Processes: An X-ray Photoemission Study of What Happens Beneath the Surface
Harald Gabasch, Frederik Klauser, Erminald Bertel, and Thomas Rauch
Lab Notes (Featuring: Bleached Pinctada Margaritifera Cultured Pearls in Non-Chocolate Colors)
Gem News International (Featuring: Yellow Danburite from Tanzania)
Book Reviews
Gemological Abstracts
Spring 2008
Volume 44, Issue 1
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The Dr. Edward J. Gübelin Most Valuable Article Awards
Copper-Bearing (Paraíba-type) Tourmaline from Mozambique
Brendan M. Laurs, J. C. Zwaan, Christopher M. Breeding, William B. Simmons, Donna Beaton, Kenneth F. Rijsdijk, Riccardo Befi, and Alexander U. Falster
A History of Diamond Treatments
Thomas W. Overton and James E. Shigley
Natural-Color Purple Diamonds from Siberia
Sergey V. Titkov, James E. Shigley, Christopher M. Breeding, Rimma M. Mineeva, Nikolay G. Zudin, and Aleksandr M. Sergeev
Lab Notes(Featuring: First CVD Synthetic Diamond Submitted for Dossier Grading to GIA Lab)
Gem News International (Featuring: Gem-Quality Afghanite and Haüyne from Afghanistan)
Book Reviews
Gemological Abstracts
Winter 2007
Volume 43, Issue 4
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Latest-Generation CVD-Grown Synthetic Diamonds from Apollo Diamond Inc.
Wuyi Wang, Matthew S. Hall, Kyaw Soe Moe, Joshua Tower, and Thomas M. Moses
Yellow Mn-rich Tourmaline from the Canary Mining Area, Zambia
Brendan M. Laurs, William B. Simmons, George R. Rossman, Eric A. Fritz, John I. Koivula, Björn Anckar, and Alexander U. Falster
Fluorescence Spectra of Colored Diamonds Using a Rapid, Mobile Spectrometer
Sally Eaton-Magaña, Jeffrey E. Post, Peter J. Heaney, Roy A. Walters, Christopher M. Breeding, and James E. Butler
An Examination of the Napoleon Diamond Necklace
Eloïse Gaillou and Jeffrey E. Post
Lab Notes (Featuring: Diamond Inclusions Fit for a Holiday Season)
Gem News International(Featuring: Yellow-Green Clinohumite and Yellow Chondrodite from Tanzania and New Cu-Bearing Tourmaline from Nigeria)
Book Reviews
Gemological Abstracts
Fall 2007
Volume 43, Issue 3
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From Single Source to Global Free Market: The Transformation of The Cultured Pearl Industry
Russell Shor
A Study of Nail-head Spicule Inclusions in Natural Gemstones
Gagan Choudhary and Chaman Golecha
Copper-bearing Tourmalines from New Deposits in Paraíba State, Brazil
Masashi Furuya
Natural Type Ia Diamond with a Green-Yellow Color Due to Ni-Related Defects
Wuyi Wang, Matthew Hall, and Christopher M. Breeding
Lab Notes (Featuring: A Rare "Piggyback" Diamond Examined)
Gem News International (Featuring: Cr/V-bearing Green Spodumene from Afghanistan)
Book Reviews
Gemological Abstracts
Summer 2007
Volume 43, Issue 2
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Global Rough Diamond Production since 1870
A.J.A. (Bram) Janse
Durability Testing of Filled Emeralds
Mary L. Johnson
Continuity and Change in Chinese Freshwater Pearl Culture
Doug Fiske and Jeremy Shepherd
Yellowish Green Diopside and Tremolite from Merelani, Tanzania
Eric A. Fritz, Brendan M. Laurs, Robert T. Downs, and Gelu Costin
Polymer-Impregnated Turquoise
Kyaw Soe Moe, Thomas M. Moses, and Paul Johnson
Lab Notes (Featuring: Opal with Unusual Structure)
Gem News International (Featuring: Pyrope-Almandine from Tanzania)
Book Reviews
Gemological Abstracts
Spring 2007
Volume 43, Issue 1
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The Dr. Edward J. Gübelin Most Valuable Article Awards
Pink to Red Coral: A Guide to Determining Origin of Color
Christopher P. Smith, Shane F. McClure, Sally Eaton-Magaña, and David M. Kondo
Serenity Coated Colored Diamonds: Detection and Durability
Andy H. Shen, Wuyi Wang, Matthew S. Hall, Steven Novak, Shane F. McClure, James E. Shigley, and Thomas M. Moses
Trapiche Tourmaline from Zambia
Thomas Hainschwang, Franck Notari, and Björn Anckar
Lab Notes (Featuring: Unusual Dendrites in a Heat-Treated Blue Sapphire)
Gem News International(Featuring: Dravite and Liddicoatite from Northeastern Mozambique)
Book Reviews
Gemological Abstracts
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