What items are the oldest known commonly worn piece of jewelry?

by AmericanDerp

I was reading this subreddit that I just discovered (it's great!): https://www.reddit.com/r/ArtefactPorn

And upon seeing some of the rings and bracelets dating back to the 1100s and such, I got curious: What items are the oldest known commonly worn piece of jewelry? Are their known family items that we may see someone wearing routinely, where that item is known to be ancient?

Searocksandtrees

Hi OP, can I get some clarification on this question?

Are you asking about: (a) specific pieces of jewelry that are still privately owned/worn today (e.g. crown jewels, famous gems); (b) the oldest kind of jewelry still worn (e.g. [made-up example] there is evidence of humans wearing bracelets for x years); or (c) the oldest known examples of jewelry (which may no longer be in private use, e.g. in a museum)

Thanks!