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LONDON, UNITED KINGDOM - AUGUST 05: The Queen Mother Arriving For A Performance Of The Musical '42nd Street' At The Drury Lane Theatre. She Is Wearing A Turquoise Evening Dress And One Of Her Favourite Necklaces Of Diamonds And Pearls That Was Originally A Wedding Gift To Princess Alexandra From Her Husband, In 1863. The Diamond Flower Brooch On Her Shoulder Was A Wedding Gift From King George Vi, Her Late Husband. (Photo by Tim Graham Photo Library via Getty Images)

LONDON, UNITED KINGDOM - AUGUST 05:  The Queen Mother Arriving For A Performance Of The Musical '42nd Street' At The Drury Lane Theatre.  She Is Wearing A Turquoise Evening Dress And One Of Her Favourite Necklaces Of Diamonds And Pearls That Was Originally A Wedding Gift To Princess Alexandra From Her Husband, In 1863.  The Diamond Flower Brooch On Her Shoulder Was A Wedding Gift From King George Vi, Her Late Husband.  (Photo by Tim Graham Photo Library via Getty Images)