Gold-tone 18-inch necklace with heart pendant

I lost my gold-tone 18-inch necklace yesterday around 3pm near the Main Street Starbucks in downtown Rapid City, West SD. It's a delicate chain with a small heart pendant about the size of a dime. The clasp is stamped with a tiny 'P' and there's a faint bend near the end of the chain where the metal shows a little wear. It was a gift from my grandmother, so it means a lot to me and I'm really hoping to get it back. If you've seen it, please reach out to me at [email protected].