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13. Camilla Parker Bowles
Prince Charles gave Camilla Parker Bowles a ring with a center five-carat emerald-cut diamond with additional diamonds on the side when he proposed in 2005. It is believed that the ring used to belong to The Queen Mother (Prince Charles' grandmother), as she had been seen wearing it in the '80s. 

Charles and Camilla married in 2005 in a civil ceremony at Windsor Guildhall, followed by a wedding blessing at St. George's Chapel.