The method of
dividing the chessboard so that each
of the four parts shall be of exactly the same size and shape, and
contain one of the gems, is shown in the diagram.
The method of shading the squares is adopted to make the shape of the
pieces clear to the eye.
Two of the pieces are shaded and two left white.
The reader may find
it interesting to compare this
puzzle with that of the "Weaver"