Article continues below advertisementPrincess Margaret shattered royal convention on her wedding day by wearing a tiara she had bought herself in a glittering symbol of independence that set her apart from the House of Windsor - and which OK! can now reveal may now be lost to history.When Margaret, who died in 2002 at age 71, married photographer Antony Armstrong Jones in May 1960, she became the first modern royal bride to reject the custom of borrowing a tiara from the royal collection.