Sinkankas Symposium
http://www.sinkankassymposium.net/18 april 2015
Dr. Raquel Alonso-Perez – Opals, History and Science of the Harvard University Collection
Dr. Eloise Gaillou – An Overview of Gem Opals: From the Geology to Color and Microstructure
Andrew Cody – Australian Opals, Especially Fossilized Opals
Alan Hart – Opals in the Natural History Museum, London
Bill Larson – A Collector's Perspective
Meg Berry – Lapidary Tricks in Cutting Opal
Nathan Renfro – The Microworld of Opal
Renee Newman – Matrix Opals and Common Opals, Part 1
Helen Serras-Herman – Common Opals, Part 2
Jack Hobart – Photographic Studies of Mexican Opals
Robert Weldon – Photographing Opal
Dr. George R. Rossman – Color in Natural Opal, and Additional Remarks
5 april 20146 april 201321 april 2012GIA (Gemological Institute of America)
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