Sterling silver heart pendant necklace

I lost my sterling silver heart pendant necklace yesterday around 3pm. I was at the Big Texan Steak Ranch on 34th Street in Amarillo, outside near the entrance, when I noticed it was missing from my neck. The chain is a slim 18-inch sterling silver with a tiny heart pendant; on the back is engraved 'Mom'. The chain shows a little tarnish near the lobster clasp, but the pendant is bright and the heart shape is still clear. This necklace was a gift from my grandmother and means the world to me, so I really need it back. If anyone found it, please reach out—I'll be forever grateful.