Is This Stunning Vintage Cartier Ring One and the Same As Mary-Kate Olsen's Engagement Ring?

Vintage Cartier Ring. Copyright 2014 Sotheby's. Sotheby's Important Jewels sales occur several times a year, drawing from among the world's most elite collectors. The most recent of these high-end sales took place on February 6, 2014, in New York City. Leading the sale was an exquisite pair of platinum and diamond pendant ear-clips by David Webb, which sold for $118,750. Curators of the sale set out to present a sampling of the evolution of 20th century jewelry, which included offerings from the 1920s, 1940s, 1950s, and 1960s, with an emphasis on signed pieces from renowned European and American jewelers. Among these precious offerings, Sotheby's sold the pictured vintage diamond and sapphire ring, estimating a sales price of $40,000-60,000. Crafted as a stylized flower made entirely of 18k gold, this gorgeous jewel was made in 1953 by Cartier. At the center rests a 4-carat Old Euro Cut diamond surrounded by 16 calibre-cut sapphires. The petals are etched in gold and set with approximately 1.50 carats of single-cut diamonds. This is just the kind of piece one would expect to see on the finger of the Duchess of Windsor in the 1950s. Today, a similar ring graces Mary-Kate Olsen's left ring finger. Several reporters speculate that this is the very ring that Ms. Olsen wears to symbolize her commitment to marry her lover, Olivier Sarkozy. The timing certainly works out. Sotheby's sold this Cartier beauty on February 6, 2014, for $81,500, and Ms. Olsen was seen wearing her bold engagement ring for the first time on March 3, 2014, during Fashion Week in New York. However, Sotheby's is not about to confirm or deny such a fantastic story. Therefore, it is extreme speculation to pair these two important jewelry events together. How cool would that be, though? To have Mary-Kate Olsen sporting a bonafide vintage engagement ring from 1950s Cartier purchased as an estate piece?