It would have been much easier if you'd specified what they looked like but, unless credited, it would be very hard to tell. You might want to consider inquiring with the following people listed:
Andrew Grey ... props
Diego Lara ... assistant property master (as Diego Maceiras)
Sarah Roach ... property master
Slade Young ... on-set dresser
Jed Gard'ner ... set dresser
Most likely they would answer email or social media posts, because they're not big shots in a movie, and will probably appreciate that you're complimenting their taste. I would suggest you do a search for who is in charge of jewelry on a TV set. Some will say "costumer" others "prop master". It all depends. Good luck and append to this answer with what you find out.
