Final answer:
A player who re-enters the game wearing jewelry after being instructed to remove it could face penalties such as being taken out of the game or given disciplinary cards, by sports safety rules.
Step-by-step explanation:
If you notice a player wearing a piece of jewelry and instruct him to leave the field to remove it, and later see him running down the field wearing it again, this violates most sports policies concerning jewelry. Coaches and referees typically enforce a no-jewelry rule for safety reasons. If the player re-enters the game wearing the jewelry after being told to remove it, the player would likely be penalized according to the rules of the sport. This could mean being taken out of the game, being shown a yellow or red card (in soccer), or other disciplinary measures as outlined by the sport's governing body or league rules.