Ross-Simons - .50 ct. t. w. Diamond Oval Cluster Earrings in Sterling Silver. Shimmering with .50 ct. t. w. diamonds, with central clusters that give the look of 1.00 ct. t. w. diamonds, our oval earrings offer instant, exceptional shine from ear to ear. Set in polished sterling silver. Post/clutch, diamond oval cluster earrings. Diamond birthstones are the perfect gift for April birthdays.