However, the oval and cushion cuts make a strong case when it comes to size. Oval Cut Ovals are widely popular, and people buying 1 ct oval diamond engagement rings usually put heavy stock by the preferences of the person who will be wearing the ring. If you are opting for one of the tricky effects such as the bow tie, it is important to first understand enough about the basics of the shape. An alternative is to choose a jeweler who knows their business really well and can guarantee the best results.   Cushion Cut You cannot go wrong with a cushion cut diamond purchase. This shape brings you the most diamond for the money you pay, as well as ensuring the best outcome in terms of brilliance. If a specific shape has not struck your fancy yet, it is a good idea to check out the cushion cut variations available to you.