Its five strands of diamonds covered her decolletage and made the Queen's jewels look quite modest as they attended the Queen's banquet for the Commonwealth Heads of Government in Kampala, Uganda, on Friday. But Camilla didn't deliberately set out to overshadow her mother-in-law - the Queen gave her permission to borrow it from the royal collection. Camilla's favourite couturier, Anna Valentine, designed her a simple duck-egg blue dress and matching stole to set off the necklace, estimated to be worth tens of millions of dollars. The Duchess added the Queen Mother's Boucheron tiara, a set of diamond earrings and...