Lost gold necklace with a delicate chain and a small heart-shaped pendant featuring a birthstone, left on a picnic table at a park in Southwest KS.

I lost my gold necklace with a small heart-shaped pendant that has my daughter's birthstone in the middle while at the park near my home in Southwest KS. I remember taking it off briefly to put on sunscreen and must have left it on the picnic table. It has a very delicate chain, and I'm really hoping to get it back as it has sentimental value.