Jewel box prediction

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&nbsp;A wooden box is introduced. The box is opened. It is seen that inside the box there are six compartments. In each compartment there are six cubes. The cubes have six different gems on top. The performer requests a member of the audience to select any cube from among those six cubes. Suppose that the spectator selects the cube with the ruby gem on top. The cube is withdrawn from the compartment for a while. And again replaced in the same compartment. Now the performer pulls a drawer from the front of the box. It is seen that there is a small ruby gem inside the drawer. The selection of the spectator is successfully predicted.<br />
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This effect is a jewel!<br />
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&bull; The box misures cm 12x7x9.<br />
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