In the 1953 classic Hollywood film, Gentlemen Prefer Blondes, Marilyn Monroe, gave a legendary performance. Clad in a bright pink ball gown and dazzling diamonds, she epitomised the significance of diamonds with her upbeat and seductive song: Diamonds Are a Girl's Best Friend. Since the 1950s, a diamond engagement ring has become the obsession of American women influenced by the advertising industries that combined desire with commerce and went onto to say, "Diamonds are forever."