Online lesson: SPINELS (HOME GEMMOLOGY SESSION 6) Gem-quality spinels and their vast colour variation. History of the use of red spinel as a gemstone in its own right or as a ruby imitation? The evolution of terminology (e.g. balas ruby). Current gem spinel deposits. Spinel treatments and synthetic spinels, from the historically relevant flame fusion varieties to modern synthetics.
April 10, 9:00 AM or 7:00 PM (Lisbon/London timezone)
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