Jewel piece box

The Diamond Piece Box is an item in the game Wario Land 4. There are 4 Diamond Piece Boxes in each level they are usually hidden through out the level. Each box has a Diamond Piece and a Gold Coin in it. The Boxes look just like boxes with the Golden Divas face on them. Well you do not need to find all of the boxes to go to the next level you do need all of them to fight the area boss.