The Diamond Cube is a classic puzzle going back to around 1900. It has 12 pcs and is a tough level 4. It is related to the Wine Barrel Puzzle in its construction techniques.
This 2-Tone version is a particularly attractive format for the puzzle. Quality is high and its a bit larger than our 1 color model. Measures about 2 5/8" cube.
CLICK HERE TO SEE A VIDEO ON THIS PUZZLE
Pcs are shown below. Instructions are quite good if you need them:)