A sightholder is a company on the Diamond Trading Company's (DTC) list of authorized bulk purchasers of rough A scattering of round-brilliant cut diamonds shows off the many reflecting facets. The mineral diamond is a crystalline form, or allotrope, of carbon (other allotropes of carbon include graphite and coal). Diamonds are renowned for their superlative physical qualities, especially their hardness—the word diamond derives from the... diamonds. DTC is controlled by the The De Beers Group is a London and Johannesburg based diamond mining corporation. It has historically held a near total monopoly in the diamond trade, although recent Israeli interests have captured 20% of the market. De Beers had been under indictment in the United States for many years for antitrust... De Beers Group, the single largest producer and purveyor of rough diamonds in the world. According to a January 13 is the 13th day of the year in the Gregorian calendar. It is still celebrated as New Years Eve by those on the Julian calendar. There are 352 days remaining (353 in a leap year). Events 888 - Odo, Count of Paris becomes King of the Franks. 1328... January 13, 2004 is a leap year starting on Thursday of the Gregorian calendar. It was designated the: International Year of Rice (by the United Nations) International Year to Commemorate the Struggle against Slavery and its Abolition (by UNESCO) Elections were held in 73 countries during 2004. See a list of elections... 2004 DTC media release ( [1] (http://www.debeersgroup.com/NR/rdonlyres/B47176E2-B42F-41A2-B4DA-0FDBEF0FCA4D/177/MR200401131.pdf)), there are 84 sightholders, and three additional companies authorized to purchase diamonds from DTC for industrial use.