sightholder
n.— «De Beers, 45 percent owned by Anglo American, has slashed the number of its so-called sightholders, or dealers allowed to buy its prestigious gems, leaving many small- and medium-sized businesses out in the cold.» —“Antwerp’s diamonds’ fate with India” in Antwerp, Netherlands Financial Express (New Delhi, India) July 11, 2005. (source: Double-Tongued Dictionary)