When the time finally came for Prince Charles to propose to his long-time partner Camilla, he dipped into the royal vaults and selected an art deco ring set with a huge emerald-cut diamond and three diamond baguettes on each side. The ring was packed with meaning as it had previously belonged to his beloved grandmother the queen mother. It's believed that the queen mother received the ring as a gift from her husband, George VI, after the birth of their first child, then-Princess Elizabeth.