J. S. Fletcher,
The Death That Lurks Unseen
(1898)
“ I was much struck by the fashion in which the old scientist examined the diamonds. He produced a glass from his waistcoat pocket, screwed it into his eye, pursed up lips and whistled softly to himself as he examined the rough stones. When he had finished, he turned an absolutely inscrutable face to Mr. Lazaroff. "Have you had any cut?" he asked. Mr. Lazaroff produced the porphyry box. When he opened it, and the glittering contents fell before Sir Adolphus's eye, I saw his face suddenly relax and then become inscrutable again. ”
