Presenters

David Ager

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David Ager is Senior Fellow within Executive Education at Harvard Business School. Professor Ager's research focuses on the leadership and organizational challenges that firms face as they conduct post-acquisition integration. He recently published a paper entitled "The Emotional Impact and Behavioral Consequences of Post-M&A Integration," which considers the complexities of post-merger integration and demonstrates how social identity, emotions, and coping strategies both motivate and constrain human behavior, leading to perverse unintended consequences that directly impact individual and organization-level goals of integration.

Authentic Leadership
Monday, October 8, 2018
9:00 AM - 10:30 AM
Grand Pacific Ballroom
Authentic Leadership

Closing Session: Futurescape Forum
Tuesday, October 9, 2018
4:00 PM - 5:45 PM
Grand Pacific Ballroom
Futurescape Forum


Dr. Saleem Ali

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Dr. Saleem H. Ali holds the Blue and Gold Distinguished Professorship in Energy and the Environment and directs the Gemstones and Sustainable Development Knowledge Hub at the University of Delaware. He is also a senior fellow at Columbia University's Center on Sustainable Investment. Dr. Ali is a member of the United Nations International Resource Panel; was chosen as a Young Global Leader by the World Economic Forum in 2011; and received an Emerging Explorer award from the National Geographic Society in 2010. His books include Treasures of the Earth: Need, Greed and a Sustainable Future; Environmental Diplomacy (with Lawrence Susskind) and Mining, the Environment and Indigenous Development Conflicts.

General Gemology and Jewelry
Tuesday, October 9, 2018
1:30 PM - 3:00 PM
Sunset Ballroom
Oral Presentation
Gemstones and Sustainable Livelihoods: From Mines to Markets


Dr. Raquel Alonso-Perez

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Dr. Raquel Alonso-Perez is curator of the Mineralogical and Geological Museum, Harvard University (MGMH). She received her PhD in Earth and Material Sciences from the Swiss Federal Institute of Technology (ETH) in Zurich and graduated as a gemologist from Gem-A. Her teaching strengths are mineralogy and gemology, and her main research interest is the study of gem deposits using non-destructive analytical techniques.

Gem Localities and Formation
Tuesday, October 9, 2018
11:00 AM - 12:30 PM
Sunset Ballroom
Oral Presentation
A Multidisciplinary Approach Towards Examining the Sources of Emeralds


Ans Anthonis

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Ans Anthonis has been chief officer, diamond lab and research at HRD Antwerp since 2013. After completing a master’s degree in physics at Antwerp University, she joined the HRD as research assistant. There she has specialized in the detection of synthetic and treated diamonds and the development of new research techniques.

Diamond Identification 2
Monday, October 8, 2018
9:00 AM - 10:30 AM
Sunset Ballroom
Oral Presentation
Fluorescence in Diamond: New Insights


Edward Boehm

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Edward Boehm is a colored stone dealer and consultant from Chattanooga, Tennessee. He has worked for the Gübelin Gem Lab and Pala International before consulting for GIA and USAID. He has authored and co-authored numerous articles and serves on the editorial review boards for Gems & Gemology, The Journal of Gemmology, and The Australian Gemmologist Journal. His company, RareSource, specializes in fine & collectable gemstones, collection sales & acquisitions, and museum & laboratory consulting.

General Gemology and Jewelry
Tuesday, October 9, 2018
1:30 PM - 3:00 PM
Sunset Ballroom
Oral Presentation
Challenges of a 21st Century Gem Trader


Dr. Christopher Breeding

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Dr. Christopher Breeding is a senior research scientist at GIA in Carlsbad, California. His areas of expertise are diamond defects, treatments, and color origin; geochemistry of minerals; and gemology and mineralogy of colored stones. Dr. Breeding received a PhD in geology from Yale University.

Gem Characterization
Monday, October 8, 2018
1:30 PM - 3:00 PM
Sunset Ballroom
Oral Presentation
Colored Diamonds: The Rarity and Beauty of Imperfection


Dennis Campbell

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Dennis W. Campbell joined the faculty of the Harvard Business School in 2003. He is currently the Dwight P. Robinson Jr. Professor of Business Administration. In addition to his academic position, he also serves as the Head of the Accounting & Management unit at HBS. During his time on the faculty, he has taught in and chaired a variety of courses in the school’s MBA, doctoral, and executive education programs in Boston, Asia and the Middle East.

Customer Centricity 2
Monday, October 8, 2018
1:30 PM - 3:00 PM
Grand Pacific Ballroom
Customer Centricity Part 2

Customer Centricity 3
Monday, October 8, 2018
3:30 PM - 5:00 PM
Grand Pacific Ballroom
Customer Centricity Part 3

Disruptive Innovation 3
Tuesday, October 9, 2018
1:30 PM - 3:00 PM
Grand Pacific Ballroom
Disruptive Innovation Part 3


Bruce Cleaver

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Bruce Cleaver is chief executive officer of the De Beers Group. During his 13-year career at De Beers, Cleaver has played a central role in shaping the direction of the business, including the development of corporate strategy, leading De Beers’ sales agreement negotiations with key governments and guiding all group mergers and acquisition activities. He led the reshaping of De Beers’ mining portfolio, creating the De Beers Technologies unit, and delivering on De Beers’ commitments to its government partners.

Since becoming CEO, Cleaver has overseen the opening of the largest new diamond mine in more than a decade, the launch of the world’s largest diamond exploration vessel, and De Beers’ buyout of LVMH’s share in the De Beers Jewellers business. In 2017, Cleaver was announced as one of UN Women’s thematic champions for its HeForShe initiative, which is focused on achieving gender equality.

Closing Session: Futurescape Forum
Tuesday, October 9, 2018
4:00 PM - 5:45 PM
Grand Pacific Ballroom
Futurescape Forum


Dr. Haim Cohen

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Dr. Haim Cohen is a professor in the Department of Chemical Sciences at Ariel University in Israel. He has been involved in the color treatment and spectroscopic analysis of diamonds since 1990. He is also the chief scientist of Dianer Diamonds Co., which is based in the Israel Diamond Bourse in Ramat Gan. Dr. Cohen holds a PhD from the Weizmann Institute of Science in Rehovot.

Gem Characterization
Monday, October 8, 2018
1:30 PM - 3:00 PM
Sunset Ballroom
Oral Presentation
Evaluating the Color and Nature of Diamonds Via EPR Spectroscopy


Dr. Ulrika F.S. D’Haenens-Johansson

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Dr. Ulrika F.S. D’Haenens-Johansson is senior research scientist for GIA Research and Development in New York. Her research areas include defect physics of natural, treated, and synthetic diamond materials using optical and EPR spectroscopy. She holds a PhD in physics from the University of Warwick, United Kingdom.

Diamond Geology
Monday, October 8, 2018
3:30 PM - 5:00 PM
Sunset Ballroom
Oral Presentation
The Lesedi La Rona and the Constellation – The Puzzle of the Large Rough Diamonds from Karowe


Phil Diggle

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Phil Diggle is a postgraduate researcher at the University of Warwick, United Kingdom, where he investigates single point defects in natural and synthetic diamond.

Diamond Identification 2
Monday, October 8, 2018
9:00 AM - 10:30 AM
Sunset Ballroom
Oral Presentation
Diamond at the Diffraction Limit: Optical Characterization of Synthetic Diamond


Gina Drosos

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Virginia “Gina” C. Drosos is the chief executive officer of Signet Jewelers (NYSE: SIG), the world’s largest retailer of diamond jewelry, where she is leading a team of more than 34,000 to deliver a world-class omnichannel experience to customers of Kay Jewelers, Zales, Jared The Galleria Of Jewelry, H. Samuel, Ernest Jones, Peoples, Piercing Pagoda and JamesAllen.com. Drosos was appointed Signet CEO in July 2017 and has served as an independent director of Signet’s Board since 2012. Drosos has more than 30 years of executive leadership experience in the consumer goods, beauty and healthcare industries, as well as retail. She is also on the Board of Directors of American Financial Group (NYSE: AFG), an insurance and investments company.

Before becoming Signet’s CEO, Drosos served as president and CEO of Assurex Health, where she delivered significant revenue growth and executed the strategic sale of the company to Myriad Genetics. Prior to her tenure at Assurex Health, Drosos spent 25 years at the Procter & Gamble Company (NYSE: PG), where she held positions of increasing responsibility with strong proven results.

Drosos has a long history of supporting purpose-driven organizations, including her role on the board of Back2Back Ministries, an international nonprofit organization that cares for orphans and vulnerable children.

Closing Session: Futurescape Forum
Tuesday, October 9, 2018
4:00 PM - 5:45 PM
Grand Pacific Ballroom
Futurescape Forum


Dr. Barbara Dutrow

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Dr. Barbara L. Dutrow is a petrologic mineralogist with research interests spanning continental scale tectonometamorphism to micrometer scale crystallochemical interactions in minerals. Her research combines geologic field mapping, geochemical and mineral chemical data, theoretical analyses and experimental work. Dr. Dutrow is the co-author of the Manual of Mineral Sciences, a best-selling textbook about mineralogy. She joined the GIA Board of Governors in November 2016, and helps guide the Institute in its mission to protect the gem-buying public.

Colored Stones and Pearls 1
Tuesday, October 9, 2018
7:30 AM - 8:30 AM
Sunset Ballroom
Oral Presentation
Tourmaline: A Gemstone’s Guide to Geologic Evolution


Dr. Sally Eaton-Magaña

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Dr. Sally Eaton-Magaña is a research scientist at GIA in Carlsbad, California, where she investigates the physics of natural, treated, and synthetic diamonds. Dr. Eaton-Magaña received a PhD in chemical engineering from Case Western Reserve University.

Diamond Identification 1
Monday, October 8, 2018
7:30 AM - 8:30 AM
Sunset Ballroom
Oral Presentation
Summary of CVD Laboratory-Grown Diamonds Seen at the GIA Laboratory


Dr. David Fisher

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Dr. David Fisher is principal scientist at De Beers Technologies UK. He started there in 1992 after obtaining his PhD in physics from Liverpool University. He contributes to a range of projects, mostly in the area of consumer confidence technical research, leading the program on diamond treatments and working closely with synthetics research. He has published widely on diamond physics and regularly presents the results of the research group’s work at international conferences.

Diamond Identification 2
Monday, October 8, 2018
9:00 AM - 10:30 AM
Sunset Ballroom
Oral Presentation
Addressing the Challenges of Detecting Synthetic Diamonds


Dr. Emmanuel Fritsch

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Dr. Emmanuel Fritsch is a professor of physics at the University of Nantes in western France. He received a geological engineering degree from ENSG and a PhD from Paris VII. He then worked at GIA from 1986 to 1995 before joining the Institut des Matériaux Jean Rouxel (IMN-CNRS). He has authored more than 350 articles and received many awards, including the 2013 Bonnano Award for Excellence in Gemology.

Colored Stones and Pearls 1
Tuesday, October 9, 2018
7:30 AM - 8:30 AM
Sunset Ballroom
Oral Presentation
“Boehmite Needles” in Corundum Are Rose Channels


Jason Goldberger

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As chief executive officer, Jason Goldberger leads Blue Nile’s strategy and long-term vision, and works with his executive partners to align merchandising, technology, marketing and customer service efforts in order to provide the best possible experience and value to its customers.

In his own words, “Our customers are trusting Blue Nile during one of the most important and stressful times of their lives. We work tirelessly to be a good partner for our customers and delight them every day.” Outside of work, Goldberger enjoys spending time with his wife and three children, playing golf, and visiting Washington wineries.

Closing Session: Futurescape Forum
Tuesday, October 9, 2018
4:00 PM - 5:45 PM
Grand Pacific Ballroom
Futurescape Forum


Dr. Lee Groat

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Dr. Groat has been a faculty member at the University of British Columbia, Department of Earth, Ocean and Atmospheric Sciences, since 1989, was the editor of American Mineralogist, and is the editor of The Canadian Mineralogist. His main research interests are the geology of gem deposits, pegmatites, the crystal chemistry of minerals and economic geology. Dr. Groat is also an independent director of multiple companies in the exploration and technology spheres.

Gem Localities and Formation
Tuesday, October 9, 2018
11:00 AM - 12:30 PM
Sunset Ballroom
Oral Presentation
Scientific Study of Colored Gem Deposits and Modern Fingerprinting Methods


Dr. Gregory Hodgins

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Dr. Greg Hodgins is the director of the University of Arizona Accelerator Mass Spectrometry Laboratory, in Tucson, Arizona. The laboratory is a world leader in cosmogenic isotope measurements, specializing in 14C, 10Be, 129I, and 26Al. These isotopes are utilized in a wide range of disciplines spanning geoscience, oceanography, atmospheric science, meteoritics, archaeology, and forensic science. Dr. Hodgins is a specialist in archaeological and forensic radiocarbon dating and the development of new applications for radiocarbon measurement.

Colored Stones and Pearls 2
Tuesday, October 9, 2018
9:00 AM - 10:30 AM
Sunset Ballroom
Oral Presentation
Radiocarbon Measurements on Pearls: Principles, Complexities, and Possibilities


Andy Johnson

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Robert Andrew "Andy" Johnson is chief executive of of Diamond Cellar Holdings, a holding company with multiple omni-channel retail stores. He is also involved in Robert W. Johnson, Inc., a corporation partnering in residential and commercial real estate. He has served on the boards of organizations such as the Nationwide Children’s Hospital and The Columbus College of Art and Design. Johnson is currently a member of the World Presidents’ Organization and the Chief Executives Organization. He has been a member of the GIA Board of Governors since November 2017.

Closing Session: Futurescape Forum
Tuesday, October 9, 2018
4:00 PM - 5:45 PM
Grand Pacific Ballroom
Futurescape Forum


Rahul Kadakia

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A recognized auctioneer at Christie’s salerooms in Geneva, Hong Kong, London and New York, Rahul Kadakia joined Christie’s — the international leader in the jewelry auction market — in 1996. In 2004, he was named head of the jewelry department for Christie’s Americas and annual auction sales have soared above $100 million in New York nearly every year since his appointment, with private sales generating many millions more.

Kadakia has been at the podium for a number of record breaking sales, including the Ellen Barkin Collection, which showcased the most important collection of jewels by JAR ever to appear at auction. Many records were achieved under his gavel, including the sale of the famed Princie Diamond, which at $39.3 million was the most valuable Golconda diamond ever sold at auction.

Kadakia was appointed International Head of Jewelry in April 2014. Under his gavel, Christie’s Geneva sold the Oppenheimer Blue Diamond for $57.5 million, a world auction record for any blue diamond.

Closing Session: Futurescape Forum
Tuesday, October 9, 2018
4:00 PM - 5:45 PM
Grand Pacific Ballroom
Futurescape Forum


Dr. Hiroshi Kitawaki

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Dr. Hiroshi Kitawaki is general manager of the research division of the Central Gem Laboratory in Japan, which he joined in 2011. Previously he was director of the research laboratory at the Gemmological Association of All Japan (GAAJ)-Zenhokyo. His gemological research is mainly focused on the application of spectrophotometers, X-ray fluorescence analysis, micro Raman spectroscope, cathodoluminescence (CL), and photoluminescence (PL) analysis to gem identification. Dr. Kitawaki is a member of the Gemological Society of Japan and International Gemmological Conference (IGC).

Diamond Identification 1
Monday, October 8, 2018
7:30 AM - 8:30 AM
Sunset Ballroom
Oral Presentation
LPHT-Treated Pink CVD Synthetic Diamond


William Larson

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William Larson is one of the world’s most knowledgeable gem and mineral experts. Starting from a small collection at age ten, he has built one of the finest private mineral collections and has made Pala International one of America’s great colored stone houses. After graduating with a degree in geological engineering from the Colorado School of Mines, Mr. Larson started Pala International in 1967. Today he travels the globe in search of fine gemstones and mineral specimens.

General Gemology and Jewelry
Tuesday, October 9, 2018
1:30 PM - 3:00 PM
Sunset Ballroom
Oral Presentation
San Diego Gemstones and Gem Localities


Klemens Link

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Klemens Link oversees the development of the Gübelin Gem Lab, where he is closely involved in establishing the Provenance Proof Blockchain initiative and developing the emerald paternity test. Mr. Link studied geology at Giessen University in Germany. From 2006 to 2013, he worked as a petrologist and research scientist at Johannes Gutenberg University in Mainz. Mr. Link joined the Gübelin Gem Lab in 2013 as research analyst and geochemical specialist and has helped conduct research on the age determination of sapphires.

Gem Localities and Formation
Tuesday, October 9, 2018
11:00 AM - 12:30 PM
Sunset Ballroom
Oral Presentation
The Proof of Provenance


Dr. Taijin Lu

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Dr. Taijin Lu is chief researcher at the National Gemstone Testing Center (NGTC) in Beijing. Prior to that he was a research scientist at the Asian Institute of Gemological Sciences, the Gemological Institute of America, and the National University of Singapore. Dr. Lu has a PhD in mineralogy and geology from Tohoku University in Sendai, Japan.

Diamond Identification 2
Monday, October 8, 2018
9:00 AM - 10:30 AM
Sunset Ballroom
Oral Presentation
Recent Developments in Detection and Gemology in China, Particularly for Chinese Synthetic Diamonds


Dr. Zemin Luo

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Dr. Zemin Luo is a lecturer at the Gemological Institute, China University of Geosciences in Wuhan. Her research experience in mineralogy and gemology includes the geological origin study of dolomite-related white nephrite using trace elements and machine learning tools. Her current research focus is on building a database to quantitatively characterize the color and chemical components of serpentine-related green nephrite, and developing a classification model based on this database to predict the geological origin of ancient green jade. Dr. Luo holds a PhD in geology from Peking University.

Colored Stones and Pearls 2
Tuesday, October 9, 2018
9:00 AM - 10:30 AM
Sunset Ballroom
Oral Presentation
Quantitative Identification of Green Nephrite from Five Major Origins in Asia and North America


Peter Lyckberg

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Peter Lyckberg is a lifelong mineral collector and researcher from Sweden. He travels the world to study the geology and mineralogy of gem and ore deposits in situ. He has extensive knowledge of the suite of gem pegmatite fields in countries such as Norway, Sweden, Finland, Ukraine, Russia, Afghanistan, Pakistan, Namibia, Brazil, and the United States. A well-known speaker, Dr. Lyckberg works as a nuclear inspector for the European Commission in Luxembourg.

Gem Localities and Formation
Tuesday, October 9, 2018
11:00 AM - 12:30 PM
Sunset Ballroom
Oral Presentation
Gem Pegmatites of Ukraine, Russia, Afghanistan, and Pakistan: An Update on Recent World-Class Finds


Dr. Claudio Milisenda

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Dr. Claudio Milisenda has been with the German Gemmological Association (DGemG) and its gemological laboratory since 1993. In 1996, he became managing director of the DSEF German Gem Lab. Dr. Milisenda serves as an editor of the journal of the German Gemmological Association. He has conducted on-site research in Europe, Africa, and Southeast Asia and received his PhD in earth science from Max-Planck Institute for Chemistry in Mainz, Germany.

Colored Stones and Pearls 2
Tuesday, October 9, 2018
9:00 AM - 10:30 AM
Sunset Ballroom
Oral Presentation
Gemstones and Photoluminescence


Janak Mistry

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New Technologies and Techniques
Monday, October 8, 2018
11:00 AM - 12:30 PM
Sunset Ballroom
Diamond Impression: The Key to Sustainable Competitiveness


Krishna Palepu

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Krishna Palepu joined the faculty of the Harvard Business School in 1983. He is the Ross Graham Walker Professor of Business Administration, and Senior Advisor to the President of Harvard University. Professor Palepu was a Senior Associate Dean at the Harvard Business School for several years, overseeing the school's research, and its global initiative.

Customer Centricity 1
Monday, October 8, 2018
11:00 AM - 12:30 PM
Grand Pacific Ballroom
Customer Centricity Part 1

Disruptive Innovation 1
Tuesday, October 9, 2018
9:00 AM - 10:30 AM
Grand Pacific Ballroom
Disruptive Innovation Part 1

Disruptive Innovation 2
Tuesday, October 9, 2018
11:00 AM - 12:30 PM
Grand Pacific Ballroom
Disruptive Innovation Part 2


Dr. Aaron Palke

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Dr. Aaron Palke is a senior research scientist at GIA in Carlsbad, California. Dr. Palke started his career in gemology in 2014 as a postdoctoral research associate at GIA after earning his PhD in geology from Stanford University. During this time, Dr. Palke investigated the geological history of gem corundum by analyzing their inclusions. He currently helps lead GIA’s colored stone research in country-of-origin determinations and treatment identification.

Colored Stones and Pearls 2
Tuesday, October 9, 2018
9:00 AM - 10:30 AM
Sunset Ballroom
Oral Presentation
What Is Cobalt Spinel? Unraveling the Causes of Color in Blue Spinels


Jason Payne

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Jason Payne is the founder and CEO of Ada Diamonds. He is interested in functional applications of laboratory-grown diamonds and regularly collaborates with academic researchers and producers to advance growth technologies. He holds a degree in computer science from Stanford University, where he focused on hardware/software interfaces. He has guest lectured at the Stanford Graduate School of Business, West Point, the U.S. Naval Academy, and the Naval Postgraduate School.

New Technologies and Techniques
Monday, October 8, 2018
11:00 AM - 12:30 PM
Sunset Ballroom
Oral Presentation
Beyond Gemstones: The Medical, Industrial, Scientific, and Computational Applications of Lab Diamonds


Dr. D. Graham Pearson

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Dr. D. Graham Pearson is one of the world’s leading scientists in diamond studies and the formation of diamond-forming roots beneath continents. He is at the forefront of developing new techniques for geochemical analysis, and has pioneered methods of dating minute geological samples. He developed the first method for dating single inclusions in diamonds and a novel ultra-low trace element measurement method for measuring the impurity content of diamonds to parts per trillion. Dr. Pearson is a Fellow of the Royal Society of Canada.

Diamond Geology
Monday, October 8, 2018
3:30 PM - 5:00 PM
Sunset Ballroom
Oral Presentation
Modern Advances in the Understanding of Diamond Formation


Menahem Sevdermish

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Menahem Sevdermish is the founder of the GWLAB gemological institute, formerly known as GIPS, and a leading expert in gem color analysis. Sevdermish is the author of the two-volume Dealer’s Book of Gems and Diamonds, comprising more than 1,000 pages, as well as many articles in respected gemological publications. Since 2003, Sevdermish has been engaged in the development of Gemewizard, the revolutionary digital gem-color communication and analysis technology used today by leading institutes around the world.

New Technologies and Techniques
Monday, October 8, 2018
11:00 AM - 12:30 PM
Sunset Ballroom
Oral Presentation
Big Data Analysis and Insights in the Online Gem and Jewelry Trade


Dr. Steven Shirey

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Dr. Steven Shirey is a senior research scientist, geochemistry, in the Department of Terrestrial Magnetism of the Carnegie Institution in Washington, DC. His research focuses on how Earth’s continents formed. These studies led to his recent work on diamonds and their mineral inclusions that represent the deepest, oldest, and most pristine mantle samples known. Dr. Shirey received a PhD in geochemistry from the State University of New York at Stony Brook before joining the Carnegie staff in 1985.

Diamond Geology
Monday, October 8, 2018
3:30 PM - 5:00 PM
Sunset Ballroom
Oral Presentation
How to Obtain and Interpret Diamond Ages


Sergey Sivovolenko

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Sergey Sivovolenko is a leading designer of computer-aided tools for diamond processing. The company he chairs, OctoNus, produces technology capable of rough diamond planning and optimization, color mapping, scanning, and cut grading.

Gem Characterization
Monday, October 8, 2018
1:30 PM - 3:00 PM
Sunset Ballroom
Quantitative Absorption Spectrum Reconstruction for Polished Diamond


Dr. Evan Smith

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Dr. Evan M. Smith is a research scientist at GIA who uses diamonds to explore the deep interior of the earth. As a leading expert in diamond geology, his research demonstrates that diamonds are some of the most scientifically valuable materials on our planet. Dr. Smith discovered that certain large and pure diamonds are formed at extreme depths, in pockets of molten metal. His work has been published in Science and Nature, and covered by The Washington Post, The Economist and National Public Radio. Dr. Smith holds a Ph.D. in geology from the University of British Columbia and is a former Liddicoat Postdoctoral Fellow.

Gem Characterization
Monday, October 8, 2018
1:30 PM - 3:00 PM
Sunset Ballroom
Oral Presentation
The Formation of Natural Type IIa and IIb Diamonds


Dr. Thomas Stachel

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Dr. Thomas Stachel has more than 20 years of research experience on diamonds and their inclusions. Since 2001, he has been professor and Canada Research Chair in Diamonds at the University of Alberta, where he heads the De Beers Laboratory for Diamond Research and the Canadian Centre for Isotopic Microanalysis. His principal research interest is diamond formation in the earth’s mantle. Prof. Stachel holds a PhD from the University of Würzburg in Germany.

Diamond Geology
Monday, October 8, 2018
3:30 PM - 5:00 PM
Sunset Ballroom
Oral Presentation
Diamond Precipitation from High-Density CHO Fluids


Martin Steinbach

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Martin Steinbach graduated in 1982 as the first German gemologist at AIGS, Thailand. As a gem merchant, collector, and lecturer, he has traveled the world in search of star gems. With the 2017 publication of his book Asterism—Gems with a Star, he has fulfilled a life’s dream. Mr. Steinbach aims to create a new philosophy and new markets for the 60 or so asteriated gems.

Colored Stones and Pearls 1
Tuesday, October 9, 2018
7:30 AM - 8:30 AM
Sunset Ballroom
Oral Presentation
An Overview of Asteriated Gems: From Common Star Sapphire to Rare Star Aquamarine to One-of-a-Kind Star Zircon


Dr. Daniel Twitchen

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Dr. Daniel Twitchen is the sales director for CVD synthetic diamonds at Element Six (E6). He has more than 20 years of research and development experience in synthetic diamond synthesis technology. An inventor or co-inventor on more than 50 patents, he has authored and co-authored more than 150 scientific publications.

Twitchen helped establish E6’s diamond manufacturing in the U.S. His areas of focus include developing technology for growing synthetic CVD diamonds with tailored properties for applications ranging from thermal management for semiconductor devices to optics for high-power lasers. He and his colleagues’ work led to the development of a range of industrial Single Crystal CVD grades that were commercialized for mechanical, optical and electronic applications. His academic research interests now include using magnetic resonance and optical techniques to study how defects in diamond affect properties such as color and electrical conductivity.

Twitchen received his master’s and doctorate degrees in physics from the University of Oxford. While there he was awarded the Harmsworth Senior Scholarship at Merton College for his doctoral studies. Following his PhD, he held a junior research fellowship, and was awarded the Engineering and Physical Sciences Research Council’s Advanced Fellowship at Oxford. He was also an invited academic to the Siberian Academy of Sciences.

New Technologies and Techniques
Monday, October 8, 2018
11:00 AM - 12:30 PM
Sunset Ballroom
Oral Presentation
Synthetic CVD Diamond – 30 Years On


Wim Vertriest

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Wim Vertriest is supervisor of field gemology for GIA in Bangkok. Since joining GIA’s Field Gemology department in 2015, Mr. Vertriest has visited gemstone mining areas in Africa, Asia, and Europe, where he was responsible for sample collection. He now oversees the field gemology department and curates GIA’s colored stone research collection in Bangkok. He obtained a master’s degree in geology (geodynamics and geofluids) in 2014 from KU Leuven in Belgium. He also holds a GIA Graduate Gemologist diploma and an FGA diploma from Gem-A.

General Gemology and Jewelry
Tuesday, October 9, 2018
1:30 PM - 3:00 PM
Sunset Ballroom
Oral Presentation
GIA’s Field Gemology Program: A Modern Approach to Origin Determination


Cristina Villegas

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Cristina Maria Villegas is director of mining at Pact, a U.S.-based non-governmental organization (NGO). She is a recognized global expert in artisanal and small-scale mining (ASM), with almost 15 years of experience in international development. She specializes in ASM, ethical sourcing, and rural development. Ms. Villegas serves as an advisory member of the Gemstone and Sustainable Development Knowledge Hub, Fairtrade Gold, Ethical Metalsmiths, ASM CRAFT Code/Market Entry Standard, UNEP Gold Program, and more. She also lectures at Columbia University.

General Gemology and Jewelry
Tuesday, October 9, 2018
1:30 PM - 3:00 PM
Sunset Ballroom
Oral Presentation
Closing the Knowledge Gap Across the Supply Chain: A Case Study of GIA and Pact’s Field Collaboration in Tanzania


Wuyi Wang

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Dr. Wuyi Wang has more than 20 years of research experience in diamond geochemistry and the treatments of diamonds and other gem materials. He holds a Ph.D. in mineralogy, experimental petrology, and geochemistry from the University of Tsukuba in Japan and a bachelor's degree in geology from the Beijing University. Dr. Wang is widely published in gemological and geological magazines, including GIA's award-winning journal - Gems & Gemology, Rapaport, Journal of Gemmology, American Mineralogist, Earth & Planetary Science Letters, and Journal of Geophysical Research. He has been recognized with numerous awards and honors, including the American Gem Society and Richard T. Liddicoat Awards, and the Dr. Edward J. Gubelin Most Valuable Article Award from Gems & Gemology. Dr. Wang has been a research scientist at the GIA Laboratory in New York since 2000.

Diamond Identification 1
Monday, October 8, 2018
7:30 AM - 8:30 AM
Sunset Ballroom
Canary Yellow Diamonds


Kent Wong

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Mr. Wong Siu-Kee (Kent Wong) is the managing director of Chow Tai Fook Jewellery Group Limited (Group), one of the largest jewelry retailers in the world. Known for its product design, quality and value, the Group has an extensive retail network in Greater China, Korea, Japan, Singapore, Malaysia and the United States, and a fast-growing e-commerce business.

Wong is responsible for the overall management of the Group, which includes the iconic brand Chow Tai Fook Jewellery and other brands like CHOW TAI FOOK T MARK, Hearts on Fire, MONOLOGUE and SOINLOVE. He has extensive experience in operations and managements, along with expanding the Group's business in Mainland China. Wong also serves as a member of the Nomination Committee and Remuneration Committee at the Group. He is also a board member of World Diamond Council and a vice chairman of the Gems & Jewelry Trade Association of China.

Recognized as an international industry leader, Wong received the Director of The Year Awards 2015 from The Hong Kong Institute of Directors. In 2016, he was awarded "CEO of the Year/Luxury/Asia" by the International Alternative Investment Review.

Closing Session: Futurescape Forum
Tuesday, October 9, 2018
4:00 PM - 5:45 PM
Grand Pacific Ballroom
Futurescape Forum


Jiahui Zhao

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Jiahui (Gloria) Zhao graduated in 2014 from China University of Geosciences, Beijing (CUGB) and gained her Bachelor’s degree in Gemmology and Material Technology. In addition, she obtained a gemology diploma issued by FGA. After graduation from CUGB, she worked for a gems and jewelry identification centre founded by the Chinese government for two years.

Diamond Identification 2
Monday, October 8, 2018
9:00 AM - 10:30 AM
Sunset Ballroom
Oral Presentation
Fluorescence, Phosphorescence, Thermoluminescence and Charge Transfer in Synthetic Diamond


Chunhui Zhou

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Chunhui Zhou is a research scientist and manager of pearl identification at GIA’s New York laboratory. He obtained his bachelor’s degree in environmental chemistry from State University of New York at Binghamton. Subsequently he earned his doctorate degree in bio-molecular chemistry from New York University prior to joining GIA in 2010. He also received GIA Graduate Gemologist diploma in 2015. Dr. Zhou’s main area of interest is identification and research of pearls and related materials, and he has made many contributions to various gemological and scientific journals.

Colored Stones and Pearls 2
Tuesday, October 9, 2018
9:00 AM - 10:30 AM
Sunset Ballroom
Unconventional Techniques in Pearl Testing: Their Potential and Limitations