14k gold chain with sapphire pendant, initials AM

Hey, I lost my 18-inch 14k gold box chain with a tiny sapphire pendant yesterday around 3pm. It's a delicate piece, the chain is about 1.2mm and the pendant is a bezel-set sapphire about 4mm in diameter. The back is engraved with the initials AM. I was walking near the coffee shop on South Florida Avenue by Munn Park when I last remember seeing it; the chain has some light scratches from wear, but it still sparkles nicely. It really means a lot to me because it was a gift from my mom, so I’d really appreciate getting it back if anyone found it.