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Your Ultimate Guide To The Most Famous Royal Engagement Rings

8. Grace Kelly
Grace Kelly had not one, but TWO engagement rings given to her by Prince Rainier III of Monaco, and they were both pretty spectacular. 

The first, shown here, is an eternity band with rubies and diamonds, designed by Cartier. It supposedly contains jewels that were family heirlooms, and the colors are meant to represent the colors shown on the Monaco flag (red and white).