Silver necklace with blue sapphire pendant

I'm hoping to get my silver necklace back. I wore it yesterday around 3pm after popping into Summit Deli on Main Street here in High Rockies. I think I must have bumped into someone or something near the gondola plaza behind the deli, and it slipped off my neck. It's a slender 18-inch sterling silver chain with a heart-shaped pendant that holds a tiny blue sapphire in the center. The back is engraved with the initials 'EM' and there's a faint scratch along the edge that you wouldn't notice unless you look closely. This necklace is a gift from my grandmother and has a lot of sentimental value. I'd be incredibly grateful to have it returned if anyone found it.