Mary-Kate Olsen

The partner: Olivier Sarkozy

The ring: Vintage Cartier, four-carat diamond with sapphire halo

The proposal: February 2014

The marriage: November 2015

Since childhood, Mary-Kate Olsen has been an icon for her role alongside her twin sister Ashley in “Full House.” She later transitioned into a critically acclaimed fashion designer and co-founder of luxury brand The Row. Her relationship with Olivier Sarkozy, a French banker, drew attention to its blend of fashion royalty with actual European lineage.

News of their engagement emerged in early 2014, and Mary-Kate was spotted wearing a unique vintage ring from 1953. It was a stunning piece from Cartier, featuring a four-carat diamond center stone surrounded by a halo of blue sapphires purchased at a Sotheby’s auction for a cool $81k. Sadly, the couple divorced in 2021.