Mia Farrow received a breathtaking engagement ring mounted with a 9-carat solitaire, pear-shaped diamond from Frank Sinatra in June of 1966. The couple kept their engagement under the radar for about a month, then were married shortly after at a hotel in Las Vegas by a Justice of the Peace. Unfortunately, the marriage lasted only two years, but Farrow's pear-shaped sparkler has remained a staple piece in the lineup of history's iconic engagement rings.
Queen Elizabeth II: Solitaire Diamond Set i