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Princess Margaret, Countess of Snowdon (1930-2002) pictured wearing a tiara and ornate necklace with her husband Antony Armstrong-Jones, 1st Earl of Snowdon at an official royal engagement in 1966.. (Photo by Rolls Press/Popperfoto/Getty Images)

Princess Margaret, Countess of Snowdon (1930-2002) pictured wearing a tiara and ornate necklace with her husband Antony Armstrong-Jones, 1st Earl of Snowdon at an official royal engagement in 1966.. (Photo by Rolls Press/Popperfoto/Getty Images)