Neither Princess Diana or Meghan Markle own the the most expensive royal engagement ring. Someone outside the House of Windsor does.

WATCH: A look back at Prince Rainier and Grace Kelly's fairytale wedding Photographed in 1963, Grace and Rainier were spotted with their children, Princess Caroline and Prince Albert, on the ...

Hollywood icon-turned-princess, Grace Kelly is celebrated not only for her timeless beauty and talent but also for her fairy-tale wedding to Prince Rainier of Monaco. On her special day ...

Grace Kelly was an American actress who retired from acting at age 26 and became Princess of Monaco by marrying Prince Rainier III in April 1956. She had three children, Princess Caroline ...

All the Details Behind Grace Kelly's Wedding Dress (Including the Royal Accessory She Chose Not to Wear!) Princess Grace's Granddaughter Charlotte Casiraghi Separates from Husband of 4 Years ...

Grace Kelly was nothing short of iconic with countless Hollywood movies and a royal wedding under her belt by the time she sadly passed away in 1982. The late Princess of Monaco's impeccable ...