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Diamonds Are a Girl's Best Friend, an iconic song from the 1953 musical "Gentlemen Prefer Blondes," is associated with the glamorous and witty character Lorelei Lee, played by Marilyn Monroe. The song humorously suggests that material wealth, especially diamonds, can bring happiness and security in a woman's life, capturing the spirit of the musical's exploration of wealth, love, and social status in a playful and memorable manner.