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. Each box has a Diamond Piece and a Gold Coin worth 500 coins in it. The Boxes bear the face of the Golden Diva. The player does not actually need to find all of the boxes to go to the next level but the player does need all of them to fight the area boss.

Once Wario collects the Diamond Piece from the Box, only the Gold Coin will pop out if he revisits the level and opens the box again.