We are proud to have world leading independent lab gemologists, gem dealers and experts as speakers.
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.
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.
Stefan Muller 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.