Online lesson: Home Gemmology (SESSION 5) Early terminology of topaz. Gem varieties of topaz and common trade names. The history of the use of topaz, with focus on the Brazilian sources of the 18th century and Russian sources of the 19th century. Natural blue and treated-blue topaz (irradiation + annealing). Common imitations.
September 30, 9:00 AM or 7:00 PM (Lisbon/London timezone)
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