Just as in fashion, jewelry trends (unique shapes! colored stones! new metals!) come and go. For an engagement ring you'll love as much 10 years from now as you do today, opt for a traditional diamond cut and fuss-free design that will never go out of style.

Style DR239, 18k white gold and diamond engagement with princess-cut center stone and emerald-cut side stones, $3,850 (without center stone), Simon G. Jewelry

See more princess-cut engagement rings. Photo: Courtesy of Simon G. Jewelry