Due to their reputation as the toughest natural mineral on earth, diamond engagement rings represent an unbreakable bond between newlyweds. Opal engagement take fourth place. Opals come in a range ...

The couple had tied the knot a year prior, in 1968—and a year before that, Polanski had given her a large, oblong, opal engagement ring encircled with rubies. Reports allege that the bauble wasn ...