In addition to the Vince Lombardi Trophy that all Super Bowl champions receive, the winner of Super Bowl 50 will also receive a large, 18-karat gold-plated "50". Each digit will weigh 33 lb (15 kg) for a total of 66 lb (30 kg). Like the Lombardi Trophy, the "50" will be designed by Tiffany & Co.
What will the number "50" be plated with? 
18-karat gold-plated 18-karat gold gold
In addition to the Vince Lombardi Trophy that all Super Bowl champions receive, the winner of Super Bowl 50 will also receive a large, 18-karat gold-plated "50".
In addition to the Vince Lombardi Trophy that all Super Bowl champions receive, the winner of Super Bowl fifty will also receive a large, eighteen-karat gold-plated "fifty".
What will the number "fifty" be plated with? 