Silver-tone necklace with heart pendant

Yesterday around 3pm I realized my silver-tone necklace was missing while I was walking near the Imperial Valley Mall on Main Street in El Centro, Imperial County. It's a 16-inch silver-tone chain with a delicate heart pendant; on the back there's an initial 'A' engraved, and a tiny star charm sits near the clasp. The pendant is slightly scratched and the chain has a light tarnish from wear, but otherwise it's in decent condition. This necklace is a gift from my grandmother and means so much to me—I'd be heartbroken if I can't get it back. If anyone found it, please contact me; I’d be forever grateful.