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Rondeau, Benjamin; Fritsch, Emmanuel; Mazzero, Francesco; Gauthier, Jean-Pierre; Cenki-Tok, Bénédicte; Bekele, Eyassu; Gaillou, Eloïse (2010). A new source of play-of-color opal at Wegel Tena, Wollo, Ethiopia. Gems & gemology, 46(2), pp. 90-105. Los Angeles, Calif.: Gemological Institute of America
