This is a beautifully smithed butterfly concha ring by Derrick Gordon. A "bumped up" center diamond is outlined by twisted square wire and fine raindrop wire. The intermediate directions are marked by "bumped up" crescents. The shank is split into four narrower bands before attaching to the ring back. This is a classic Traditional Revival design that is so difficult to find these days.
Hallmarked Derrick and stamped Sterling inside.
Ring face: 1 1/2" x 7/8"
Width of shank in back: 3/16"
Size: 7 1/4