We are proud to have world leading independent lab gemologists, gem dealers and experts as speakers.
Sergey Sivovolenko & Roman Serov
Octonus is a pioneer in applying technology to optimise the value of cut diamonds, including instruments to plot inclusions and software to plan highest value cuts. The company is also noted for developing advanced software to understand the appearance of facetted diamonds including those of fancy colour. Research by Octonus to analyse what makes a diamond ‘beautiful’ has allowed them to develop special cuts based on the findings and create instruments which allow effective diamond-beauty-focused communication throughout the production chain up to the end users.
John Chapman has worked in the diamond industry for over 30 years specialising in technological aspects. His work has covered the industry pipeline from exploration, mining, recovery, sorting, faceting and grading. Much of his learning and application has been with Rio Tinto Diamonds where he was manager of diamond technology. He now consults to the industry and constructs the ‘Inspector’ range of instruments for synthetic diamond detection.
Dr. Michael Schlamadinger
Dr. Michael Schlamadinger is Head of Procurement for the Swarovski Gemstones Business. He graduated from the University of Graz in Mineralogy and Petrology in 1990. Additional to his role as a purchaser of rough and cut natural and synthetic gems, he has been in the market of man-made diamonds for well over 6 years.
Garry Holloway has a BSc in Applied Geology and a Gemmology & Diamond Diploma (GAA). He has been active in consumer diamond education focusing on cut quality as a director of Pricescope on which he ran Holloway Cut Adviser. He Invented the ideal-scope in 1984 and a version of the ASET scope in 1987. Patent applications by Garry include shop lighting for diamonds, ‘Looks like’ diamond size and several with the Cut Group (Sergey Sivovolenko, Janak Mistry and Yuri Shelementiev). Garry currently runs two Melbourne jewellery stores he founded in 1976 – Holloway Diamonds.
Katrien de Corte
Katrien started her gem career as a research scientist at HRD Antwerp. She specialized in research and development of decision rules and techniques to discriminate natural from synthetic and treated diamonds. Now she is head of Education at HRD, Antwerp and teaches gemmology at the University of Ghent as a guest professor. She established HRD Antwerp schools around the world, and developed new courses.
Dr. Stefanos Karampelas
Dr. Stefanos Karampelas is the Research Director for the Bahrain Institute for Pearls and Gemstones (DANAT). He holds an Advanced Gemmology Diploma from the University of Nantes (France), a PhD in Materials Physics from the same university, a MSc in Geosciences from the University of Rennes (France) and a BSc in Geology from Aristotle University of Thessaloniki, Greece. Stefanos is a lecturer for the Advanced Gemmology Diploma at the University of Nantes, France, on pearls, laboratory methods applied to gems as well as origin determination of coloured gems. He has published over 40 research papers on different gem material in various scientific journals, contributed to books, delivered various lectures and visited several gem mines and pearl farms around the globe. He is a member of the Editorial Board of Gems and Gemology and an Associate Editor of The Journal of Gemmology
Abeer Al Alawi
Abeer Al-Alawi is the Executive Director for the Bahrain Institute for Pearls and Gemstones (DANAT). She has over 25 years’ experience in the gemstone testing industry, having held various positions in Bahrain. Her career began in 1992 as a hallmarking specialist at Assay followed by a move to the Gem and Pearl Testing laboratory. She then became Head of the Gem and Pearl Testing Laboratory for 10 years and the Director of Precious Metal & Gemstones for 3 years before moving to DANAT. Abeer holds a Bachelor (Hons) in Jewellery Design and Silversmithing from University of Buckinghamshire (U.K.), a diploma in Gemmology (FGA), in diamond grading from GIA and she is also a Certified Diamond Grader (CDG; HRD Antwerp).
Edward Boehm is a colored stone dealer and consultant. He began his gemological studies in Switzerland where he spent the summers of his youth under the tutelage of his Grandfather, Dr. Edward J. Gübelin. Boehm began his career working for Overland Gems in Los Angeles and then joined the Gübelin Gem Lab in Lucerne, Switzerland, to further develop his skills in gem identification and research. He worked with Bill Larson at the renowned colored gemstone and mining firm of Pala International for five years before venturing out on his own “Rare Source Gems” in 1996. In 1992, Dr. Gübelin invited Edward to accompany him to Burma to visit the famous Mogok valley. They were the first western gem dealers in 35 years allowed to visit the famous gem producing area.
Stefan Müller studied Geosciences at the Johannes Gutenberg Universität Mainz. His special interest is origin determination of various coloured gemstones working with LA-ICP-MS, EDXRF, EPMA, UV-Vis-NIR, IR and studying inclusions with Raman microscopy. Since 2016 he has worked for the DSEF German Gem Lab and is currently undertaking a PhD about HPHT treatment of natural and synthetic diamonds.
Dr. Clemens Schwarzinger
Dr. Clemens Schwarzinger is associate Professor for chemistry at the Johannes Kepler University Linz, Austria. In 2016 he founded the Center for Scientific Gemmology at the University Linz. He is owner of a small company which is dedicated to precision gemstone cutting and developing novel cut designs. In 2017 he won the US Faceters Guild Single Stone competition in the Master category. He is one of twelve artists invited to participate in the lapidary extravaganza From Somewhere in the Rainbow at the 2019 Tucson show.
Gamini Zoysa FGA & GG worked on Mineralogy of Embilipitiya gem deposits for his PhD thesis. He has discovered several new gem deposits including Sapphirine and colorless Enstatite . Currently he is the director of the International Colored Gemstone Association ( ICA ) for Sri Lanka. He is the managing director of the Ceylon Gemmological Services which certifies and appraises gems and jewellery.
Gail Brett Levine
Gail Brett Levine, GG, independent personal property appraiser, has been in the jewelry trade for over 30 years. She received her GG diploma in residence from GIA (NY) in 1980 and serves on the Executive Council of the GIA Alumni Association and the Association for the Study of Jewelry and Related Arts. Currently, she is the Executive Director of The National Association of Jewelry Appraisers, the largest gem and jewelry appraisal organization in the United States. Ms. Levine is also President of Timeless, Inc. (1982 to present) specializing in insurance, estate, and donation appraisals. In 1994, she started the subscription based publication Auction Market Resource for Gems and Jewelry.
Travis Lejman, GIA GG, has been in the industry for 20 years. He is the second generation in his family and has recently taken over & continues to grow the company his father started in 1979. After receiving his BSc. from Stony Brook University in 2005, Travis continued on to graduate with his G.G. in 2006 from GIA New York’s residency program, and later going on to receive his F.G.A. accreditation from Gem-A in 2013. Over the last 6 years, Travis and his business partner, Joshua Lents, have added new advanced testing capabilities to their laboratory division.
Branko Deljanin is President at CGL-GRS, 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.
After graduating as gemmologist at GIA, Yianni became an instructor at GIA. Later, Melas began working for Swarovski as a rough stone buyer operating in several remote locations around the world. In 2004, after fourteen years at Swarovski, he joined the Lev Leviev Group, a leading diamond manufacturer. Through his work he sought to develop Botswana’s gem industry, with the belief that supporting an industry with business opportunities would help create jobs, and would allow self-empowerment to thrive. His concern for the welfare of Africans saw him stage a much publicised hunger strike in 2018. In 2015 he discovered a new blue green gem in Africa, which he named Aquaprase™. This year he is launching his trademarked jewelry brand, Yianni Melas™.