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LONDON, UNITED KINGDOM - NOVEMBER 19: The Queen Mother, Prince Charles And Princess Diana [ Prince And Princess Of Wales ] Arriving For The Royal Variety Performance At The Victoria Palace Theatre. The Queen Mother Is Wearing A Full-length Turquoise Evening Dress And White Fur Stole. Her Tiara, Made By Boucheron, Consists Of Diamonds Given By De Beers Of South Africa To Edward Vll In 1901. (Photo by Tim Graham Photo Library via Getty Images)

LONDON, UNITED KINGDOM - NOVEMBER 19:  The Queen Mother, Prince Charles And Princess Diana [ Prince And Princess Of Wales ] Arriving For The Royal Variety Performance At The Victoria Palace Theatre.  The Queen Mother Is Wearing A Full-length Turquoise Evening Dress And White Fur Stole.  Her Tiara, Made By Boucheron, Consists Of Diamonds Given By De Beers Of South Africa To Edward Vll In 1901.  (Photo by Tim Graham Photo Library via Getty Images)