Beautiful and tragic, actress Marilyn Monroe will always be associated with the allure of gems—if nothing else, her signature song Diamonds Are a Girl’s Best Friend will ensure that. The Hollywood diva, whose glittering career ended with her controversial death in 1962, appeared draped in jewellery for her show-stopping song in Gentlemen Prefer Blondes in 1953. But though her character, showgirl Lorelei Lee, had been caught in compromising photos with a diamond mine owner, the...