Benjamin Rondeau, Emmanuel Fritsch, Francesco Mazzero, Jean-Pierre Gauthier, Bénédicte Cenki-Tok, et al.. Play-of-color opal from Wegel Tena, Wollo Province, Ethiopia.
Gems & Gemology : the quarterly journal of the Gemological Institute of America, GIA - Gemological Institute of America, 2010, 46 (2), pp.90-105.
⟨10.5741/GEMS.46.2.90⟩.
⟨hal-00560177⟩