Early-medieval amethyst beads were subject MA thesis Robbin van Splunder (Univ of Amsterdam): came from Eastern Mediterranean (not India)!https://twitter.com/caitlinrgreen/status/849707354853650433 …
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The thesis shoulder be open access from University of Amsterdam, or else you are welcome to contact Robbin - she is on Facebook and LinkedIn
Hm. Not on repository :( Does it offer scientific analysis of Byzantine amethyst source—something not done before, afaik—or simply opinion?
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