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Prince Andrew with Sarah Ferguson at Buckingham Palace after the announcement of their engagement, London, 17th March 1986. Ferguson's white and yellow gold engagement ring features a Burma ruby, surrounded by ten drop-diamonds. (Photo by Tim Graham/Getty Images)

Prince Andrew with Sarah Ferguson at Buckingham Palace after the announcement of their engagement, London, 17th March 1986. Ferguson's white and yellow gold engagement ring features a Burma ruby, surrounded by ten drop-diamonds. (Photo by Tim Graham/Getty Images)