A rare colored dimond ring, set with a modified octagonal-shaped fancy purplish red diamond weighing 2.36 carats, the largest red diamond to appear for sale, is seen during a press preview 06 November 2007 in Geneva ahead of a Christie's jewellery auction. The ring is estimated to fetch 900,000 to 1'100'000 euros (1'200'000 to 1'500'000 US dollars) during the traditionnal autumn sales next week in Geneva. AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)