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12. Queen Margrethe of Denmark
Queen Margrethe of Denmark's ring is definitely one of the most unique on the list. It's called a "toi et moi" ring, which translates to "you and me," and features two stones — one for the bride and one for the groom. Margrethe's ring specifically has two square-cut diamonds, estimated to be about six-carats each, set on a yellow gold band. 

French diplomat Henri de Laborde de Monpezat proposed to Margrethe with this ring in 1966. Margrethe became the Queen of Denmark when her father died in 1972.