Poster Presenters

COLORED STONES AND PEARLS

3D Reconstruction of the Internal Structures of Pearls
Emiko Yazawa
GIA, New York City, New York, United States
Co-author: Chunhui Zhou

Atypical “Bead” Cultured Pinctada Maxima Pearls Nucleated with Freshwater Non-Bead-Cultured Pearls
Promlikit Kessrapong
GIA, Bangkok, Thailand

Chinese Freshwater Cultured Pearl Industry at a Crossroad
Qishen Zhou
Gemmological Institute, China University of Geosciences, Wuhan, China
Co-author: Ren Lu

Comparison of Laser Ablation and Solution Inductively Coupled Plasma Mass Spectrometry Analyses of Emeralds
James M.D. Day
Mineralogical and Geological Museum, Harvard University, Cambridge, Massachusetts, United States
Co-authors: Ruan Hattingh, Raquel Alonso-Perez, Aaron Palke, and Lee Groat

Fluid Effervescence: A New Process for Natural Color Variation in Gems
Dan Marshall
Simon Fraser University, Burnaby, Canada

The Heat Treatment of Basalt-Related Blue Sapphires
Wasura (May) Soonthorntantikul
GIA, Bangkok, Thailand
Co-authors: Ungkhana Atikarnsakul, Charuwan Khowpong, and Sudarat Saeseaw

“Low-Temperature” Heat Treatment of Mozambican Ruby
Sudarat Saeseaw
GIA, Bangkok, Thailand
Co-authors: Boodsakorn Kongsomart, Charuwan Khowpong, and Ungkhana Atikarnsakul

Pearl Classification: GIA’s Approach
Joyce Wing Yan Ho
GIA, New York City, New York, United States
Co-author: Sally Chan Shih

A Pearl Identification Challenge
Nicholas Sturman
GIA, Bangkok, Thailand
Co-authors: Laura M. Otter, Artitaya Homkrajae, Areeya Manustrong, Nanthaporn Nilpetploy, Kwanreun Lawanwong, Promlikit Kessrapong, Klaus Peter Jochum, B. Stoll, H. Götz, and Dorrit E. Jacob

The Study of Tanzanite’s Gemological and Color Characteristics
Jinding (Lydia) Yu
Asian Institute of Gemological Sciences, Bangkok
Co-author: Ren Lu

DIAMOND GEOLOGY

Evidence of Subducted Altered Oceanic Crust into Deep Mantle from Inclusions of Type IaB Diamonds
Tingting Gu
GIA, New York City, New York, United States
Co-authors: John Valley, Kouki Kitajima, Michael Spicuzza, John Fournelle, Richard Stern, Hiroaki Ohfuji, and Wuyi Wang

Origin of Rare Fancy Yellow Diamonds from Zimmi (West Africa)
Karen V. Smit
GIA, New York City, New York, United States
Co-authors: Ulrika F.S. D’Haenens-Johansson, Daniel Howell, Lorne C. Loudin, and Wuyi Wang

Type Ib Dominant Mixed-Type Diamond with Cuboctahedral Growth Structure: A Rare Diamond Formation
Kyaw Soe Moe
GIA, New York City, New York, United States
Co-author: Paul Johnson

DIAMOND IDENTIFICATION

Complex Charge Transfer in Chameleon Diamonds: A Model of the Color-Change Process
James Butler
Cubic Carbon Ceramics, Washington, D.C., United States
Co-authors: Keal S. Byrne, Wuyi Wang, and Jeffrey E. Post

Fluorescence, Phosphorescence, Thermoluminescence and Charge Transfer in Synthetic Diamond
Jiahui (Gloria) Zhao
Department of Physics, University of Warwick (Coventry, UK) and EPSRC Centre for Doctoral Training in Diamond Science and Technology, Warwick, United Kingdom
Co-authors: B.G. Breeze, B.L. Green, Phil D. Diggle, and Mark E. Newton

Melee Diamonds: Metal Defects and Treated Color
Shoko Odake
GIA, Tokyo, Japan

Nitrogen in CVD Diamond
Alexander Zaitsev
College of Staten Island, City University of New York, New York, United States

Steps in Screening and ID of Lab-Grown Diamonds with Synthetic Diamond ID Kit
Branko Deljanin
CGL-GRS Canadian Gemlab, Vancouver, British Columbia, Canada
Co-author: John Chapman

GEM CHARACTERIZATION

3161 cm–1 Infrared Feature in Synthetic Sapphires
Gagan Choudhary
Gem Testing Laboratory, Jaipur, India
Co-author: Sandeep Vijay

Agate Analysis by Raman, XRF, and Hyperspectral Imaging Spectroscopy for Provenance
Aaron Celestian
Natural History Museum of Los Angeles County, California, United States
Co-authors: Arlen Heginbotham, Rebecca Greenberger, Bethany Ehlmann, Bibek Samanta, Alyssa Morgan, and Sergey Mamedov

Beryllium Heat Treatment of Blue Sapphire from Sri Lanka
Sutas Singbamroong
Department of Geological Science, Chiang Mai University, Thailand
Co-authors: Panjawan Thanasutthipitak and Thawatchai Somjaineuk

Gemological and Spectroscopic Characteristics of Australian Sapphires
Yafen Xu
Gemmological Institute, China University of Geosciences, Wuhan, China
Co-author: Jingru Di

A Grading Method of Jadeite Jade Transparency Based on Digital Image Analysis
Danlu Cui
Gemmological Institute, China University of Geosciences, Wuhan, China

Inclusion Characteristics of Wax-Like Amber After Hydrothermal Treatment
Yan Li
Gemmological Institute, China University of Geosciences, Wuhan, China
Co-author: Yamei Wang

Interesting Inclusions in Peridot from Jilin, China
Zhiqing Zhang
Co-authors: Min Ye and Andy H. Shen (presenter)
Gemmological Institute, China University of Geosciences, Wuhan, China

IR Absorption Spectrum of Type Ib HPHT-Created Diamonds as an Indicator of Their Growth Conditions
Viktor Vins
Velman, Ltd., Novosibirsk, Russia
Co-authors: Alexander Yelisseyev, Dmitry Bagryantsev, and Alex Grizenko (presenter)

Laue X-Ray Back-Scatter Spot Patterns: A Novel Way of Identifying Various Gemological Crystals
Hollis Milroy
University of Toronto, Ontario, Canada
Coauthor: Sandra Hektor

Multifunction Spectrometer for Color Grading and Identification of Diamonds and Gemstones
Yan Liu
Liu Research Laboratories, South El Monte, California, United States

Nephrite from Luodian, Guizhou Province of China
Quanli Chen
Gemmological Institute, China University of Geosciences, Wuhan, China
Co-authors: Xianyu Liu, Haitao Wang, Wenjing Zhu, Sujie Ai, and Zuowei Yin

“Raindrop” Turquoise from China
Ling Liu
Gemmological Institute, China University of Geosciences, Wuhan, China
Co-authors: Mingxing Yang, Yan Li, Yalun Ku, Jia Liu, and Zenmin Luo

Tianhuang Stone—The Most Valuable Seal Stone in China
Tao Chen
Gemmological Institute, China University of Geosciences, Wuhan, China
Co-authors: Yungui Liu and Quanli Chen

Unusual “Vorobyevite” Beryl from Afghanistan
Yang Hu
Gemmological Institute, China University of Geosciences, Wuhan, China
Co-author: Ren Lu

Young Blue Sapphires from Muling, China
Yimiao Liu
Gemmological Institute, China University of Geosciences, Wuhan, China
Co-author: Ren Lu

GEM LOCALITIES

Blue Sapphires from Mogok, Myanmar
Ungkhana Atikarnsakul
GIA, Bangkok, Thailand
Co-authors: Wim Vertriest and Wasura Soonthorntantikul

Geographic Origin Determination of Ruby and Sapphire Using Sr-Pb Isotopes
Mandy Krebs
GIA, New York City, New York, United States
Co-authors: D. Graham Pearson, A.J. Fagan, and C. Sakar

Gold Sheen Sapphire and Syenite/Monzonite-Hosted Sapphire from Kenya
Yusuke Katsurada
GIA, Tokyo, Japan
Co-authors: Makoto Miura and Kazuko Saruwatari

Magmatic Sapphire from Yogo Gulch, Montana, and from Bingham Canyon, Utah: Some Surprising Commonalities
Jeffrey D. Keith
Brigham Young University, Provo, Utah, United States
Co-authors: Aaron C. Palke and James E. Shigley

Tourmaline-Sapphire-Phlogopite Rocks of the Badakhshan Province of Northeastern Afghanistan: Insights into a Favorable Environment for Blue Sapphire Development
Darrell Henry
Department of Geology and Geophysics, Louisiana State University, Baton Rouge, Louisiana, United States
Co-authors: Barbara Dutrow and Ziyin Sun

Trends in World Colored Gemstone Production, 2006–2016
Thomas Yager
U.S. Geological Survey, Reston, Virginia, United States

GENERAL GEMOLOGY AND JEWELRY

Advances in Hydrocarbon Gemology: The Jet Group
Sarah Steele
Whitby Museum, Whitby, United Kingdom

Color Origin of Gem Diaspore: Correlation to Corundum
Che Shen
Gemmological Institute, China University of Geosciences, Wuhan, China
Co-author: Ren Lu

Education as a Tool for Development in East African Gem Mining Regions
Marvin Wambua
Amor Gems Ltd., Nairobi, Kenya
Co-authors: Norbert Massay, Robert Weldon, Pedro Padua, and Dona Dirlam

Enameling Chinese Cultural Relics
Shangjia Wen
Gemmological Institute, China University of Geosciences, Wuhan, China
Co-author: Ren Lu

The Evolving Supply Chain—How Greater Awareness of the Value of Mineral Resources Spawned a Movement to Restrict Their Outflow from Producing Nations
Stuart Robertson
Gemworld International, Inc., Glenview, Illinois, United States

The Gem Collection at the Natural History Museum, London: A Collection of Collections
Robin Hansen
Natural History Museum, London, United Kingdom

Gemology and Appraising: Similarities and Differences
Susan Eisen
Susan Eisen Fine Jewelry & Watches, El Paso, Texas, United States

Gemstone Durability Chart
Kennon Young
Vermont Gem Lab, Burlington, Vermont, United States

Good News and Bad News: Two Tales of Products of Endangered Species Used in Jewelry
Charles Carmona
Guild Laboratories, Los Angeles, California, United States
Co-author: Jo Ellen Cole

The History and Current Status of Colored Gemstone Grading
Henry Ho
Asian Institute of Gemological Sciences, Bangkok, Thailand
Co-author: Barbara Wheat (presenter)

The Human (Humane) Trail: Finding Relevance in Jewelry Along the Pathway of Transparency
Brian Cook
Nature’s Geometry, Graton, California, United States

The Impact of Fluorescence on Current Marketability
Richard B. Drucker
Gemworld International, Inc., Glenview, Illinois, United States

Impacts and Expectations for the Fourth Industrial Revolution in Gemstone Faceting
Lee W. Haynes
LWH, Berkeley, California, United States

The Importance of Precious Metal Marks: Past, Present, and Future
Danusia Niklewicz
Hallmark Research Institute, San Francisco, California, United States
Co-authors: William Whetstone and Lindy Matula

Jewelry Development Impact Index at the University of Delaware
Patricia Syvrud
Minerals and Society Program, University of Delaware, Newark, Delaware, United States
Co-author: Saleem H. Ali

The New Economics of Diamond Mining
Russell Shor
GIA, Carlsbad, California, United States

A Rare Nearly Pure End-Member Grossular Garnet with Color-Change Effect
Supparat Promwongnan
Gem and Jewelry Institute of Thailand, Bangkok, Thailand
Co-author: Apitchaya Buathong

Rolling Around in the Light—A Spherical Exploration of Gem Optics
Sylvia Gumpesberger
University of Toronto, Ontario, Canada

Science Has a Place on the Selling Floor
Maureen Moses
Adventure Gemstones, San Diego, California, United States

Supplementary Techniques with Potential to Assist in Freshwater Pearl Identification
Artitaya Homkrajae
GIA, Carlsbad, California, United States
Co-authors: Chunhui Zhou, Ziyin Sun, and Troy Blodgett

University of Arizona Gem and Mineral Museum and Endowed Chair in Gemology
Eric Fritz
Department of Geosciences, University of Arizona, Tucson, Arizona, United States
Co-authors: Zakaria Jibrin and Robert T. Downs

NEW TECHNOLOGIES AND TECHNIQUES

Beyond the 4Cs Basics Towards Core Diamond Features (Fire, Brilliance, Etc.)
Alexander Mosyaikin
OctoNus Software, Moscow, Russian Federation
Co-author: Janak Mistry

Creating Gems Using the Zirconia Sintering Process
Etienne Perret
Ceramique By Etienne Perret, Camden, Maine, United States

Fluorescence Spectroscopy for Gemstone Screening and Identification
Tsung-Han Tsai
GIA, New York City, New York, United States

Image Analysis Techniques Applied to Clarity Issues
Troy Blodgett
GIA, Carlsbad, California, United States
Co-author: Andrew Regan

Matrix-Matched Standards for Trace-Element Analysis in Ruby and Sapphire
Jennifer Stone-Sundberg
GIA, New York City, New York, United States
Co-authors: Timothy Thomas, Zachary Cole, Yunbin Guan, Ziyin Sun, Troy Ardon, and John L. Emmett

Novel Method of Diamond Color Grading by Raman Spectroscopy
Joe C.C. Yuan
Taidiam Technology (Zhengzhou) Co., Ltd. and Zhengzhou Solstar Diamond Co. Ltd., Zhengzhou, China
Co-authors: Ju-Tsung Liu and Gavin D.S. Pan

Quantitative Determination of Cr3+ and V3+ Contents in Rubies by Spectral Fitting of UV-Vis-NIR Spectra
Tom Stephan
German Gemmological Association, Idar-Oberstein, Germany
Co-authors: Tobias Häger, Ulrich Henn, and Wolfgang Hofmeister

From Screening to D-tection
Marleen Bouman
HRD Antwerp, Antwerp, Belgium
Co-authors: Ellen Biermans and Ans Anthonis

A Simplified Species Classification for Gem-Quality Tourmaline by LA-ICP-MS
Ziyin Sun
GIA, Carlsbad, California, United States
Co-authors: Aaron C. Palke, Christopher M. Breeding, and Barbara L. Dutrow

Swept-Source Optical Coherence Tomography for Imaging the Internal Structure of Pearls
Nick DelRe
Gemological Science International, New York City, New York, United States
Co-authors: Nate Kemp, Joey Jabbour, and Andres Zuluaga

Symposium Feature Article

The future belongs to those who adapt.

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Futurescape Forum Highlights

Industry leaders see challenges and opportunities.

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