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GUELDER led the way through the iron door to the bench at the farther end of the room. He had had six chairs placed for his audience. He passed from hand to hand a square--cut diamond which was so deep a yellow that it was almost brown.
-"This is the stone, gentlemens, with which I experiment. It is of great value and the largest stone I have yet used; I chose this because of its peculiar shape, and because I think that its particular refractive qualities may give me better results in a stone of this shape."