Advice on shops that sell original objects and gadgets related to role-playing games (like D&D)?

Hi everyone! I'm in Paris and I would like to bring home some Christmas gifts, among which I would like to find, if anyone knows, a shop that sells for example necklaces with a pendant in the shape of a role-playing game dice (d20) or other nice objects inspired by Dungeons & Dragons, possibly not the usual gadgets that are a bit obvious and already seen, but something special. Thank you!