The tiara has played a glittering role in the lives of the elegant and extravagant from the doe-eyed Audrey Hepburn in the film classic Roman Holiday to generations of England's royal family-representing the height of sophisticated glamour. Worn for centuries by nobility and high society, tiaras are enjoying renewed popularity among today's movie stars and modern brides. Created in conjunction with an exhibition of tiaras at the Museum of Fine Arts,...