FEATURE-Emeralds seek the 'De Beers' treatment By: Reuters: Company News June 13, 2012 at 18:10 PM EDT NEW YORK, June 13 (Reuters) - A year ago, Heraldo Casas found a 32-carat emerald on the outskirts of a mine near Bogota that he sold for $170,000 to a vendor. Read More >> Related Stocks: BlackRock JPMorgan Chase & Co