FIFA:

1. Safety

A player must not use equipment or wear anything that is dangerous.

All items of jewellery (necklaces, rings, bracelets, earrings, leather bands,

rubber bands, etc.) are forbidden and must be removed. Using tape to cover

jewellery is not permitted.

The players must be inspected before the start of the match and substitutes

before they enter the field of play. If a player is wearing or using unauthorised/

dangerous equipment or jewellery the referee must order the player to:

• remove the item

• leave the field of play at the next stoppage if the player is unable or unwilling

to comply

A player who refuses to comply or wears the item again must be cautioned.

SAY:

7.   PERSONAL EQUIPMENT
      A.  Illegal equipment:  The following shall be considered examples of illegal equipment, and shall not be worn by any player.

           -  Shin-guards with exposed sharp edges
           -  jewelry or watches
           -  face or spectacle guards
           -  helmets of hard material
           -  any type of cast or splint (other than so-called inflated "air" casts or splints), even though covered with soft padding
           -  knee brace(s) - unless wrapped and covered with soft padding and approved by the referee
           -  cleats with sharp edges
           -  foreign objects in the mouth (such as gum or ice), other than internal orthodontic devices
  
        NOTE:  The foregoing examples are not intended to be all-inclusive.  The referee may determine other equipment to be illegal
        or dangerous.  However, the items listed in 7-A are to be considered illegal equipment (except as noted) at all times. Use of 
        these items shall not be permitted at any time, even by agreement between the coaches and the referee.