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Crowning glory! Since Queen Mary commissioned the Cambridge Lover's Knot Tiara in 1913, the pearl-and-diamond piece has stunned on the heads of multiple royal family members, including Queen Elizabeth II, the late Princess Diana and now her son Prince William's wife, Duchess Kate, who donned it for the second time at Buckingham Palace on December 8, 2016. Scroll to see the royal stunner's most memorable moments!