LONDON - SEPTEMBER 20:  Author of " Diamonds" Vicky Patterson models the Black Orlov diamond during a photocall, September 20, 2005 in London, England.  The 67.5-carat diamond Black Orlov, believed to be responsible for the death of two Russian princesses and a New York diamond dealer, forms part of an exhibition of Diamonds at the Natural History Museum.  (Photo by Bruno Vincent/Getty Images)