Gold-tone heart necklace with sapphire

I lost my gold-tone heart necklace yesterday around 3pm near the Merced Mall on G Street. It’s a slim chain with a tiny heart pendant that has a sapphire in the center and a delicate engraving on the back that reads 'A.J.' The chain shows some wear and the clasp sits a bit skinnier than it used to be. It means a lot to me because it was a gift from my mom, and I’d really appreciate getting it back if anyone finds it.