Unbranded, unmarked ring has a shallow portrait jasper (at least that's what I think it is) set in a backed bezel with an attached split shoulder shank.
The stone is approximately 22mm x 16mm x 5mm and probably weighs around 13 carats.
The face of the ring is 25mm long and 19mm wide. The band is 6mm wide and 1.3mm thick in the back
The band has a nice flourish detail in the back -- a third center "strand" that curls around the side instead of joining the the other two strands at the bezel.
No marks but ring tests as sterling silver.
The stone is in good shape and nicely polished but the silver shows some wear as you can see in the photos.