The expert can generally distinguish it from
the precious stone which it is counterfeiting; but if he is in doubt he
lays it on a flatiron and hits it with a sledgehammer. If it is a
diamond it holds its own; if it is anything else, it is reduced to
powder. I liked that experiment very much, and did not tire of
repetitions of it. It was full of enjoyable apprehensions, unmarred by
any personal sense of risk. The De Beers concern treats 8;000 carloads
--about 6,000 tons--of blue rock per day, and the result is three pounds of
diamonds. Value, uncut, $50,000 to $70,000. After cutting, they will
weigh considerably less than a pound, but will be worth four or five
times as much as they were before.
All the plain around that region is spread over, a foot deep, with blue
rock, placed there by the Company, and looks like a plowed field.
Exposure for a length of time make the rock easier to work than it is
when it comes out of the mine. If mining should cease now, the supply of
rock spread over those fields would furnish the usual 8,000 car-loads per
day to the separating works during three years. The fields are fenced
and watched; and at night they are under the constant inspection of lofty
electric searchlight.
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