Gold ring with emerald stone, lost near Cedar Falls Library

I lost my gold ring yesterday around 5:15pm near the Cedar Falls Public Library on Main Street. I’d taken it off briefly while I browsed a book and grabbed a coffee across the street, and realized it was gone as I stood up to leave. It’s a slim 14k gold band with a small emerald stone set on top. The inside of the band is engraved with 'A.K. 1974' and there’s a tiny dent near the setting from a fall last winter. The emerald looks a bit lighter green in sunlight. It means a lot to me—it’s a gift from my grandmother and has sentimental value. If anyone found it, message me here and we can arrange a pickup.