PRINCESS GRACE OF MONACO was gifted a jaw-dropping diamond engagement ring in the 1950s, but the rock was not the first engagement ring the actress received.

American actress Grace Kelly, Princess of Monaco (1929 – 1982) as she attends an unspecified event, Philadelphia, 1959. Kelly’s Cartier diamond necklace nearly outshined her engagement ring.

The most expensive royal engagement ring belongs to Grace Kelly, the Hollywood actress who became Princess of Monaco. Kelly’s Cartier ring was given to her by Prince Rainier III in 1956.