Issues

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Fall 2009
Volume 45, Issue 3

Editorial: New Technologies Face Off with New Realities

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: Preliminary Observations on New Rubies from Mozambique)
2009 Challenge Winners
Book Reviews
Gemological Abstracts

Summer 2009
Volume 45, Issue 2

Editorial: Gems & Gemology: The First 75 Years

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

Editorial: 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

Editorial: Challenges, Changes, and New Directions

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

Editorial: A New Gemological Challenge: Synthetic Diamond Melee

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

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

Editorial: 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

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

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

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

Editorial: 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