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Lady Diana Spencer, later Diana, Princess of Wales (1961 - 1997) watching Prince Charles play polo at Windsor, UK, with Princess Anne (right), shortly before their wedding, 26th July 1981. Diana is wearing a gold bracelet and a new watch, both gifts from Prince Charles. (Photo by Tim Graham Photo Library via Getty Images)

Lady Diana Spencer, later Diana, Princess of Wales  (1961 - 1997) watching Prince Charles play polo at Windsor, UK, with Princess Anne (right), shortly before their wedding, 26th July 1981. Diana is wearing a gold bracelet and a new watch, both gifts from Prince Charles.   (Photo by Tim Graham Photo Library via Getty Images)

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Diana, Princess of Wales (1961 - 1997) attends a polo match at Cowdray Park Polo Club in West Sussex on her second wedding anniversary, 29th July 1983. (Photo by Princess Diana Archive/Getty Images)

Diana, Princess of Wales  (1961 - 1997) attends a polo match at Cowdray Park Polo Club in West Sussex on her second wedding anniversary, 29th July 1983.   (Photo by Princess Diana Archive/Getty Images)

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Royalty, England, Circa 1981, Lady Diana Spencer at a Polo match (Photo by Bob Thomas/Popperfoto via Getty Images/Getty Images)

Royalty, England, Circa 1981, Lady Diana Spencer at a Polo match  (Photo by Bob Thomas/Popperfoto via Getty Images/Getty Images)