The best armour in the game apart from the gold armour is the platinum armour and sword. To get the platinum armour you have to win a PvP and go to the three white pillars in the PvP arena at the end of the battle there should be chests with platinum armour or sword.

Note: The chests don't drop both platinum armour and sword most of the time they spawn two swords or armours it is very rare to get both in the chests.