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A Diamond Piece coming out of a Diamond Piece Box.
A Diamond Piece is an item in the game Wario Land 4. Four of these items can be found in each level and they are found inside of a Diamond Piece Box. Wario does not need to find all the Diamond Pieces to go on to the next level, but he does need to find them all to beat the area boss. What passage Wario is in determines the color of the diamonds.