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AUDI Magazine - Argentina . 2004 Life Style - Colombian Emeralds By Ricardo Frascara- GEMTEC - FotoWeb (Photos) Le Régne Minéral 2002 The Emeralds of Gachala, Colombia: history, genesis and paleonthological discoveries By Pierre Vuillet, Gaston Giuliani, Jean-Claude Fisher, Pierre-Jacques Chiappero Revue de Gemmologie A.F.G. Juillet 2000 The Green Fluorite of Peñas Blancas By Pierre Vuillet á Ciles Revue de Gemmologie A.F.G. Juilliet 2000 The Green-Blue Euclase of Colombia By Franck Notari D.UG N.J.A , Pierre Yves Boillat Phis, E.P.F.L., Candice Grobon Gems & Gemology Fall 2000 Gem news Rubies (and sapphires) from Colombia By G.I.A Gem trade laboratory Gems & Gemology Summer 1999 On the identification of various emerald fillings By Mary L. Johnson, Shane Elen and Sam Muhlmeister Gems & Gemology Winter 1999 Clasifying emerald clarity enhancenmet By Shane McClure, Thomas M. Moses Mahatannous and John Koivula Cromos #4149 agosto 1997 Precious Stones Luz Stella Tocancipa The Great Book of the Emerald 1990 By Martin de Retana Lapidary journal January 1988 Muzo emerald By Ron Ringsrud Geomundo vol.12 No2 Emeralds in the world and in History By Luz Stella Tocancipa Gems& Gemology Summer 1986 The Coscuez mine a major source of colombian emeralds By Ron Ringsrud