An Art Deco c1925 ring with a round diamond set in between two small round pearls. The mounting is built in 14K yellow gold with hand engraved detailing and a platinum top around the diamond. Marks inside the ring suggest it was perhaps made in Eastern Europe. A maker's mark "RCO" is stamped inside. The diamond has a large flaw but is exceptionally bright.
Currently a size 8-1/4 and could be resized in the 6.5 to 9 range for $75.
Note that pearl rings are somewhat delicate and not well suited to daily wear.