Named for one of the most distinguished and influential figures in gemology and mineralogy, The John Sinkankas Symposium is an annual one-day event featuring presentations by specialists working in a wide range of fields. Respected authorities on gemstones have described The Sinkankas Symposium as the most important gemological conference held in North America. The annual event is organized by Roger Merk and co-sponsored by The San Diego Mineral and Gem Society and the Gemological Institute of America
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