Gold pendant necklace with sapphire, initials P.K.

I lost my gold pendant necklace yesterday around 3pm near the Philharmonic Hall on Hope Street, Liverpool. It's a delicate 14k gold pendant about 1.3 cm wide on an 18-inch thin chain, with a small sapphire set in the center. The back is engraved with the initials 'P.K.' and there's a tiny nick along the edge from wear. It has enormous sentimental value—a gift from my mum and a quiet reminder of her; I really need it back. If anyone found it, please drop me a message here; I’d be so grateful to have it returned.