Done over by jeweller - anything I can do?

[Puzzledandpissedoff]

Posting here for traffic, and yes I know it's a first world problem but I'd appreciate any advice

My 18ct yellow gold rope chain broke, and the jeweller I took it to for repair has substituted a 9ct chain (very clear just by the weight and colour). Obviously I queried this at the time, and equally obviously he denied it while avoiding my eyes and then scuttling into the back of the shop

The chain was my late mum's so I don't have a receipt, but the 18ct is stamped on the clasp - only now it doesn't match the chain itself
I'm not sure there's much I can do TBH, but if anyone has any suggestions I'd be grateful

Take this to small claims court. Tell this scamming jewellery what you are going to do, to give him the chance to put it right. If he doesn't give you your original necklace (probably melted down now), go to court, costs are minimal but bad publicity for him. If you get no recompense at court, name & shame him.