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Queen Juliana (in the Rose Cut Diamond Bandeau and Mellerio Ruby Parure) and Prince Bernhard of The Netherlands joined Crown Princess Beatrix (wearing the Dutch Laurel Wreath Tiara for the first time) at a Gala Performance of the London Festival Ballet at the Stadsschouwburg (Municipal Theatre) in Amsterdam on this day in 1956, part of a series of celebrations to celebrate the Crown Princess’ 18th Birthday.