14K gold ring with emerald centerpiece

I lost my 14K yellow gold ring yesterday around 6pm near the Milwaukee Public Market on Water Street in the Third Ward. It's a slim brushed band with an emerald-cut green stone in a delicate four-prong setting, and two tiny diamonds on either side. The inside is engraved 'A&O', a unique detail I’ll remember. It may have slipped off my finger when I ducked into a cafe and hurried back toward Lincoln Memorial Drive. This ring is my grandmother’s and carries a lot of sentimental value, and I really need it back. If you find it, please reach me through the app.