Cartier on Twitter: "In 1956, Prince Rainier proposed to Grace Kelly with a #Cartier ring adorned with an emerald-cut diamond solitaire. http://t.co/sS6NPSnJKC" / Twitter
Princess Grace of Monaco's second engagement ring cost £30million - 'soaring in value' | Express.co.uk
Grace Kelly Engagement Ring Pictures, Prince Rainier of Monoco; Celebrity Weddings | Glamour