Yes you can wear minimal jewellery
Yes, but limited. You should look professional.
Yes but not face piercings
You are allowed to wear earrings as long as they are not dangling. Watches, Bracelets, Rings,Necklaces are also fine as long as they are not causing any safety hazards. Beware of wearing any facial piercings it is considered as being unprofessional and they may not give you the job because of it.