The pair were greeted with applause by guests as they attended a gala dinner at Windsor Castle, where their marriage will take place on 8 April. With a beaming smile and wearing a deep fuchsia Jean Muir evening gown, Camilla posed with Charles for photographs and proudly flashed her platinum engagement ring, which she was wearing for the first time. The ring - a royal family heirloom - has a squarecut central diamond with three diamond baguettes on either side.