18-inch gold-tone necklace with heart pendant

I lost my 18-inch gold-tone necklace yesterday around 3pm near the San Marcos Public Library on East Hopkins Street. It's a delicate piece with a tiny sapphire accent in a heart-shaped pendant, attached to an 18-inch gold-tone chain. The clasp is stamped 'AH' and there's a faint scratch on the back from years of wear. It means a lot to me—it's a gift from my aunt and helps me feel connected to her. If anyone found it, please reach out; I’d really appreciate getting it back.