Gold pendant necklace with sapphire and A+M engraving

I lost my gold pendant necklace yesterday around 3:15pm near Market Square in Cambridge, right outside the Guildhall and Grand Arcade entrance. It's a delicate 18k gold chain, about 16 inches, with a small teardrop pendant that holds a genuine sapphire. The back is engraved with A+M and there’s a tiny bend in the clasp from years of wear. It was a gift from my grandmother and carries a lot of sentimental value, so it means a lot to get it back. If anyone happened to pick it up, I’d really appreciate hearing from you.