Designed by Bill Cutler, made by Walt Hoppe, and purchased 2006.
(15 pieces including the pearl and shell, 4.5 inches)

The goal is to place the thirteen wedge shaped pieces and the pearl (the little round piece) into the shell. After achieving the configuration shown above, the pearl is off to the right in the keeper hole, the pieces meet at a point in the center, and there appears to be no extra space. Now for the fun; the pieces can all be flipped over and space made to place the pearl in the center of the shell: