He measured me for a moment. "No doubt it is very absurd. You will not
believe me even when I tell you, so that it is fairly safe to tell
you. And it will be a comfort to tell someone. I really have a big
business in hand, a very big business. But there are troubles just
now. The fact is ... I make diamonds."

"I suppose," said I, "you are out of work just at present?"

"I am sick of being disbelieved," he said impatiently, and suddenly
unbuttoning his wretched coat he pulled out a little canvas bag that
was hanging by a cord round his neck. From this he produced a brown
pebble. "I wonder if you know enough to know what that is?" He handed
it to me.

Now, a year or so ago, I had occupied my leisure in taking a London
science degree, so that I have a smattering of physics and mineralogy.
The thing was not unlike an uncut diamond of the darker sort, though
far too large, being almost as big as the top of my thumb. I took it,
and saw it had the form of a regular octahedron, with the curved faces
peculiar to the most precious of minerals. I took out my penknife and
tried to scratch it--vainly. Leaning forward towards the gas-lamp, I
tried the thing on my watch-glass, and scored a white line across that
with the greatest ease.

I looked at my interlocutor with rising curiosity. "It certainly is
rather like a diamond. But, if so, it is a Behemoth of diamonds. Where
did you get it?"

"I tell you I made it," he said. "Give it back to me."