A must read.
Useful link:
http://www.washingtonpost.com/sf/world/2015/08/09/the-dangerous-search-for-emeralds-in-colombia/?hpid=z1
Useful link:
http://www.washingtonpost.com/sf/world/2015/08/09/the-dangerous-search-for-emeralds-in-colombia/?hpid=z1