14k gold chain with sapphire heart pendant

I lost my 14k yellow gold chain necklace yesterday around 4pm near Riverfront Park in Marysville, Yuba-Sutter, along the 2nd Street sidewalk by the pedestrian bridge. It's a delicate 16-inch chain with a heart-shaped pendant that has a tiny blue sapphire set in the center. There's a small engraving on the back that reads 'P'. The necklace was a gift from my grandmother, so it means a lot to me and I'm really hoping to get it back.