Rose-gold pendant necklace with heart charm

I lost my rose-gold pendant necklace yesterday around 3pm near the National Corvette Museum on Corvette Boulevard in Bowling Green. It's a slim 18-inch chain with a small heart pendant about the size of a nickel, and there's a tiny sapphire inlay with an 'M' engraved on the back. The chain has a few micro-scratches, but the clasp still works and the pendant shines. This necklace was a gift from my grandmother and carries a lot of sentimental value—I really need it back if anyone saw it or picked it up.