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1.- Emerald: The most valuable Beyl; the most precious gemstone
Behmenburg, C.
Lapis International, 2002
extraLapis English
Museo
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2.- Gemmology, geology and origin of the Sandawana emerald deposits, Zimbabwe
Zwaan, J.C.
Leiden: Nationaal Natuurhistorisch Museum, 2006
Scripta Geológica
Revistas
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