Top 10 one-of-a-kind celebrity engagement rings

#8 Mary-Kate Olsen’s vintage ring fit for royalty

At the end of February of 2014, Mary Kate Olsen and Olivier Sarkozy announced their engagement. The 17-year age difference between the two may come as a shock, but the size and beauty of the vintage Cartier ring, is even more jaw-dropping. A loop of sapphire gems encircles the four-carat diamond and was originally sold by Sotheby’s, bringing the grand total to $81,250, E! Online confirms.

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