Gold-tone necklace with turquoise heart pendant

I lost my gold-tone necklace with a turquoise heart pendant yesterday around 3pm in Fort Lauderdale. It's an 18-inch chain with a small lobster clasp, and the heart pendant has a tiny initial 'M' engraved on the back. The chain is a bit worn, and the turquoise stone shows a faint crack along the edge that’s easy to spot. I was strolling along Las Olas Boulevard by the Riverwalk, near a cafe outside the Riverfront shops when I must have dropped it. It means a lot to me—it was a gift from my mom, and I really need to get it back.