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1.- Age and origin of gem corundum and zircon megacrysts from the Mercaderes-Rio Mayo area, south-west Colombia, South America
Elsevier; Amsterdam; III; International, 2008
The genesis of gem deposits
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2.- EUCLASE FROM COLOMBIA SHOWING THREE-PHASE INCLUSIONS
GEMMOLOGICAL ASSOCIATION AND GEM TESTING LABORATORY OF GREAT BRITIAN; LONDON; GBR; UNITED KINGDOM, 1996
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3.- The identification value of the 2293 cm (super -1) infrared absorption band in natural and hydrothermal synthetic emeralds
Gemmological Association and Gem Testing Laboratory of Great Britain; London; GBR; United Kingdom, 2006
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