Okay, thanks for providing additional description - and the more-informative photo. I asked for them because though I myself am not greatly knowledgable about rings, some of the ring-experts in this forum could use your additional details to help identify and date your item.
Now, given that I'm not a ring-expert, there is one possibly-significant thing I can tell you about your ring. In my 32 years of coin/ring & relic-hunting, I haven't seen a ring we could be sure was manufactured prior to the 20th century which had the "divided band" form. (Made that way to permit easy adjustment to the wearer's finger-size). That form seems to be primarily (but perhaps not entirely) a 20th-century development.
Caution-note: Readers, do not mistake a "divided band" with a band that has cracked/split. Lots of rings were made from a straight strip of metal, which was bent into a circle, then the ends of the strip were soldered or brazed together to hide the "seam" in the circle. Sometimes that seam will pop back open ...especially when a slightly-buried ring has been repeatedly frozen and warmed by exposure to weather extremes. I myself dug a very old gold-alloy wedding ring that that had happened to. Don't mistake a popped seam for a "divided band" form of ring.
Regards,
TheCannonballGuy