Part 1: GRS Talk at 13th ICA Congress 2009 in Panyu, China

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Uploaded by on May 18, 2009

Dr. A. Peretti, director of GRS Gemresearch Swisslab AG, talking about research on the origin and treatments of valuable rubies from Winza ,Tanzania (Part 1) and tourmalines from Brazil and Mozambique (Part 2), with Chinese Translation

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