Silver necklace with heart pendant, engraved initials

I lost my silver necklace yesterday around 3pm near the Falls Park entrance by the Washington Pavilion on 8th Street in Sioux Falls. It's a thin sterling-silver chain, about 18 inches, with a tiny heart pendant. The back is engraved with the initials 'A.K.' and the clasp shows a little wear from daily use. It was a gift from my grandmother and means a lot to me—it's sentimental and I really hope to get it back. If anyone found it, please reach out; I can meet somewhere safe to pick it up.