Camilla's necklace dazzled Rod Stewart The Duchess of Cornwall dazzled Philadelphia's high society and rocker Rod Stewart early today as she stepped out in an elaborate ruby and diamond necklace. Camilla joined the Prince of Wales at a glitzy white-tie gala at the US city's Academy of Music for its 150th anniversary where Stewart was the star act. The Duchess's expensive jewels - 36 rubies interlaced with diamonds - were her own. Stewart said of the necklace after meeting the royals backstage: "It was gorgeous. She always looks glamorous to me. "I can see what he sees in her quite honestly, between you, me and the lamp post."