A sightholder is a company on the Diamond Trading Company's (DTC) list of authorized bulk purchasers of rough diamonds. The Diamond Trading Company (DTC is the rough diamond sales and distribution arm of the De Beers Family of Companies In Mineralogy, diamond is the allotrope of carbon where the carbon atoms are arranged in DTC is controlled by the De Beers Group, the single largest producer and purveyor of rough diamonds in the world. De Beers and the various companies within the De Beers Family of Companies engage in exploration for diamonds, diamond mining diamond trading and industrial diamond manufacture In May 2006, DTC released a list of the 93 sightholders on its website.
The DTC Sightholder list was further reduced to 79 companies worldwide in December 2007. The list of selected companies for the 2008-2011 contract period was published in April 2008. ([1])
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