Popular today for large asymmetrical striking facets that catch the light and antique reminiscence, diamonds mounted in limited supplies of European-cut Engagement Rings are a tall order to match the increasing demand. Appearing in the mid 1800's, the Old European-cut Diamond or OEC, has a round symmetrical circumference often with an open culet, a high crown and 58 facets, similar to the Old Mine-cut Diamond but more round than cushion-shaped.