Gold-tone necklace with sapphire pendant

I lost my gold-tone necklace yesterday around 3pm near the Peace Gardens by the Crucible Theatre in Sheffield. It's a slim 18-inch chain with a small sapphire pendant about the size of a pea, and there’s a tiny engraving of the initial 'M' on the back. The clasp feels a bit stiff and the chain is just a touch worn, especially where the pendant hangs. It was a gift from my mum and has sentimental value, so I’m really hoping to get it back. If you found it, drop me a message here and we can arrange a quick meet-up in the city centre.