.30 Emerald Diamond Engagement Ring in Platinum. This elegant engagement ring features a .30 carat emerald cut emerald and .35 carats of diamonds finished in platinum. The center emerald has a cool, sea green hue and is haloed by eighteen (18) .019 carat diamonds that stretch onto the shoulders of the band. The emerald is bezel set with delicate milgrain details. The head of the ring has a geometric shape finished on a petite platinum band.