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.

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.

Kate Middleton is the keeper of one of the most iconic pieces of royal history, an engagement ring that catapulted the monarchy into pop culture superstardom. When Prince Charles slipped a 12 ...