Silver necklace with emerald charm, sentimental gift

I lost my silver necklace yesterday around 3pm near the fountain at Heartland City Center on Main Street in Heartland Florida. It’s a 16-inch sterling silver chain with a small heart-shaped pendant set with a tiny emerald. The back of the pendant is engraved with an 'M'. The chain clasps with a simple spring-ring, and there’s a light dent on the side from a fall last winter. It means a lot to me—it was a gift from my grandmother and carries a lot of sentimental value. If anyone found it, I’d be grateful to get it back.