Queen Mary's Crown (Left) Queen Elizabeth The Queen Mother's Crown (Right) -- Queen Mary's Crown, which was worn at the coronation on June 22nd 1911, was Her Majesty's personal property. ***** it was given by her to the King as the ***** of the Sovereign, to be worn by future King's *****. The famous Keh-i-noor diamond which was in Queen Mary's Crown of Queen Elizabeth the Queen Mother since 1936. December 03, 1952.