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Mary-Kate Olsen's Engagement Ring: New Details and Photo!

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He liked it, so he put a huge vintage Cartier ring on it! Mary-Kate Olsen‘s engagement ring from Olivier Sarkozy has had us buzzing since the moment she debuted it in N.Y.C. Now we have new photos of her showing it off during Paris Fashion Week, as well as more details about the diamond-and-sapphire stunner.

According to a StyleCaster source, the ring was chosen for Olsen at a Feb. 6 Sotheby’s auction, where it sold for $81,250. The Sotheby’s catalog description of the ring lists it as having a 4-carat European-cut center stone, plus 16 calibré-cut sapphires surrounding it and about 1.5 carats of diamonds forming the “petals” around the high-set stone. It dates from 1953 and was previously owned by “a Tennessee collector.”

PHOTOS: I Really Love my … Star Faves!

Sotheby’s declined to comment on the buyer to StyleCaster, but the clothing designer let the bauble speak for itself while attending the Louis Vuitton show in Paris Tuesday, showing support for new Vuitton designer Nicolas Ghesquière. Also tight-lipped? Her younger sister Elizabeth, who was all smiles while skirting a question about her excitement for Mary-Kate, saying “I’m not saying a thing!”

See up-close views of the ring here, then tell us: What do you think of the new bling? Do you love a unique engagement ring? Comment below!

–Alex Apatoff, reporting by Peter Mikelbank