The most expensive royal engagement ring doesn't belong to either Princess Diana, Meghan Markle, or anyone in the House of ...

This one might be the most famous colored-stone engagement ring ... she debuted an oval-cut ruby on a floral band, while in 2010, she showed off an oval-cut sapphire on a pavé band.

Deschanel had the perfect pink manicure for her engagement to Jonathan Scott, who proposed with a "Folie de Pres" (which ...