Silver locket with pearl centerpiece, initials RP

I lost a silver locket yesterday around 3:15pm near the Portland Museum of Art on Congress Street. It's a small oval silver locket with a single freshwater pearl set in the center and the initials 'RP' engraved on the back. The front has a tiny rose engraving, and the hinge is a bit loose, so the lid sits a touch wonky when you pick it up. I had it in a little black velvet pouch in my coat pocket when I last saw it. It means a lot to me; it was a gift from my grandmother and holds a tiny pressed lavender leaf on the inside. If someone found it, I'd be really grateful to get it back.