All the Details on Mary-Kate Olsen's Engagement Ring

You're probably heard that Mary-Kate Olsen is now engaged to Olivier Sarkozy, and she is not sporting a very, very large ring on THAT finger. According to the sleuths at Stylecaster, Olsen's engagement ring is a vintage Cartier (so Mary-Kate), purchased at a Sotheby's jewelry auction in NYC on February 6. The center European-cut diamond...Read more»