Hi thank you for your reply.
I thought 50s too. They are pristine though, except for few light scratches to the back of the clasps they look new.
I got three necklaces from the charity/thrift shop, they look like the same lady owned them. The other set is a two string, it's a tiny bit dirty and looks like that one was the one she wore the most. ( sadly they didn't know anything about the lady)
I can't see a makers name would it be obvious? I'm puzzled as I cant find similar despite a lot of searching!
The lengths are 49cm each.