We are proud to have world leading independent lab gemologists, gem dealers and experts as speakers.
Dr. Thomas Hainschwang
Dr. Thomas Hainschwang is Director and co-founder of GGTL Laboratories. Dr. Hainschwang has been working on the analysis of diamonds, coloured stones and pearls for the past 21 years, and is a respected expert in the field of gemmological research, with extensive experience in the complex topic of coloured diamond. Besides his expertise as a multidisciplinary gemmologist with specialization in diamond research and testing, Dr. Hainschwang has developed and built many analytical instruments for gem and pearl testing in the past years. He received the Antonio C. Bonanno Award for Excellence in Gemology in 2015 and the Gemmological Excellence Award of the Swiss Gemmological Society in 2017.
Dr. Philip Martineau
Philip Martineau is Senior Manager Physics at De Beers Technologies UK. He earned a D. Phil. in solid state physics from Oxford University and joined De Beers in 1990 after periods of research at the Universities of Chicago and Cambridge. For many years he has been heavily involved in a research programme focused on providing knowledge and instruments to allow synthetic diamond and treated diamonds to be identified and clearly distinguished from natural untreated diamonds. He manages De Beers Technologies UK intellectual property and the De Beers university research scheme and also oversees development work carried out for Forevermark and IIDGR.
Branko Deljanin is President at CGL-GRS, Swiss Canadian Gemlab in Vancouver (Canada). He is a research gemologist with extensive experience in advanced testing of diamonds and gemstones to determine origin of color. Branko is instructor of “Advanced Gemology” programs on diamonds and coloured stones offered in 15 countries on 4 continents. In 2001 he earned his Advanced Gemology Diploma (DUG) from the University of Nantes in France. He has been a regular contributor to trade and gemological magazines and presented reports at a number of research and gemological Conferences, including Mediterranean Gemmological and Jewelry Conference that he co-founded in 2015.
Dr. Yuri Shelementiev
Dr Yuri Shelementiev is the managing director of the Moscow State University Gemmological Centre which he founded in 1995 and developed the educational programs and courses. He is a specialist on synthetic and treated diamonds which was the subject of his PhD thesis. Yuri has been a Director of the Russian Gemmological Society and currently his expertise also extends to coloured stones and jewellery.
Alberto Scarani (GG) is an appraiser of the Chamber of Commerce and Registered Expert of the Tribunal of Rome and is vice-president of the Scientific and Ethic Committees of Assogemme. Alberto is the editor of the Rivista Italiana di Gemmologia and Co-Administrator of Gemologyonline.com. With Mikko Åström he founded in 2012 M&A Gemological Instruments, a company specializing in the manufacture of advanced gemological instruments.
Mikko Åström is gemologist FGA (with distinction), laboratory technician and IT entrepreneur having more than 20 years of experience as a gemologist, head of the diploma courses of Gem-A teaching center at Helsinki and author of gemological articles, books and course materials. He has worked extensively in the field of gemological spectroscopy, designing and inventing UV-VIS-NIR, Raman, PL, FTIR and other advanced laboratory instruments.
Gail Brett Levine
Gail Brett Levine is President of Timeless, Inc. specializing in insurance, estate, claims and donation appraisals of antique, estate and contemporary jewelry, precious metals and loose diamonds and colored stones and gem consulting. Ms. Levine is Executive Director of The National Association of Jewelry Appraisers (NAJA) – the largest membership association specializing exclusively in gem and jewelry appraising and related appraisal issues. She currently serves on the Executive Council of the GIA Alumni Association as well as an officer of the Manhattan Chapter of the GIA Alumni.
Bear is the lab director of Stone Group Laboratories and partner in Bear Essentials. He enjoys traveling to gem producing and treatment centers researching the latest trends in gemology and visiting with other lab directors. On-site research allows him to keep abreast of new synthetics and treatments in the marketplace. Bear has served on several international committees and boards to promote the accurate disclosure of treatments and regularly writes articles on lab findings, newly mined gem materials, and his own research.
Roman Serov is a researcher in Octonus/Moscow State University Gemmological center. He has been studying diamond spectroscopy for the past 15 years. His main interests are technologies development for the diamond industry and scientific applications related with complex cases of natural/treated/synthetic diamond identification. He was involved in extensive diamond optical performance study and development of fancy colored diamond optimization, colorless diamond cut optimization technologies and other technologies for the diamond industry.
After completing a master’s degree in physics at the University of Antwerp, Belgium, Ans Anthonis joined the Hoge Raad voor Diamant (HRD) in 2002 as a research assistant, working on the detection of synthetic and treated diamonds. Two years later, she was promoted to Applied Research Manager, taking up the responsibility for the quality control of the HRD’s gemological laboratory for the detection of synthetic and treated diamonds and for the development of new research techniques. In 2013, Ms. Anthonis was promoted to Chief Officer Diamond Lab and Research of HRD Antwerp NV. She continues to be responsible for all the grading labs of HRD Antwerp and the research team.
Martin P. Steinbach
Martin P. Steinbach fell in love with Asia and graduated in 1982 as the first German gemmologist at AIGS in Thailand. He completed his FGG in Idar-Oberstein in 1983 and as a gem merchant and lecturer, he travelles the world looking for star gems. Martin is author of recently published 900-page Asterism – Gems with a Star, with over 1000 pictures and more than 25 years of hard work.
Cara is vice-president and senior gemologist at Stone Group Laboratories and president of Bear Essentials, a wholesale colored gemstone business. A fellow of the Gemmological Association of Great Britain (Gem-A). Cara is also a tutor for the Diploma in Gemmology course for the Gem-A. She brings a lifetime of experience working with gems to both the lab, her clients, and her students. Growing up with family in the retail jewelry business, Cara has been involved in the wholesale trade since 1986.
George, founder of I.G.L., is a Gemmologist and Jewellery Valuer. He is considered to be an authority in the Identification and Certification of Diamonds and Precious Stones in Greece. He is also an instructor holding Diamond Course and Coloured Stones seminars at IGL premises as well as at the Mediterranean School of Gemmology. Together with CGL-GRS head gemmologist Mr. Branko Deljanin, George is a co-founder of the Mediterranean Gemmological and Jewellery Conference (MGJC).
Menahem Sevdermish, FGA, D.Litt., is considered one of the world-leading experts in gem color analysis and mine-to-market. Since 2003, Sevdermish has been engaged in the development of Gemewizard, the revolutionary digital gem-color communication and analysis technology and its applications, used today by GIA and Gem-A, as well as other major leading institutes around the world. Sevdermish is the author of a two-volume book called “The Dealer`s Book of Gems and Diamonds”, and has also published many articles in world-renowned magazines such as Gems & Gemology and Journal of Gemology.
Guy Borenstein, FGA, EGG, is serving as VP Gemological Services for the digital gem color analysis company Gemewizard, specializing in gem color grading and evaluating. Borenstein is responsible for the research and development of new gem- and gemology-related applications and for the communication and relationship with gemological laboratories and institutions. Borenstein also functions as a Chief Gemologist at the European Gemological Center (EGC) and at the GWLAB chain of laboratories, directing the professional fields, research and advanced instrumentation departments.
John is a diamond scientist who formerly worked at Rio Tinto Diamonds. He has developed diamond-related machines and instruments including the ‘PL Inspector’. He currently consults throughout the industry pipeline from exploration to polished grading. He is also chief editor for the proceedings of the Mediterranean Gem and Jewelry Conferences.
Antoinette Matlins, PG, FGA is an author of 7 books and numerous articles in international media focussed on educating consumers on gem identification and scams. Her articles and comments have appeared in international magazines and newspapers — including The New York Times, The Daily Mail, Forbes, Business Week, Rapaport Report, and Conde Nast’s Traveler — and she has been seen repeatedly on national and international TV programs including ABC, CBS, NBC, and CNN. She was recipient of the Bonanno Award for Excellence in Gemology in 2010 and is a Fellow of the Gemological Association of Great Britain.
Ya’akov is the founding and past editor of InColor Magazine, and is currently Editor-in-chief of the World Diamond Magazine. A few years ago, Ya’akov was instrumental in the revival of Gem-A’s Journal of Gemmology. Ya’akov has had 30 years hands-on experience in the diamond, gem and jewelry industry, combined with marketing communications and public relations.