My son was "disqualified" from a legion playoff game last year for wearing a livestrong-like charity bracelet that he'd worn every inning through the HS and legion seasons. Now for Christmas he's asked for one of these Phiten titanium necklaces that the major leaguers have worn for the past couple of seasons.
Despite the claimed medicinal benefits, I'm afraid this would be considered jewelry, and therefore not allowed on the field.