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A diamond, the locksmith reminds himself, is only a piece of carbon compressed in the bowels of the earth for eons and driven to the surface in a volcanic pipe.

At Ruby Hill near Bingara they were found in a breccia filling a volcanic pipe.

But if Connel found the yellow ground while setting the charge, and took time to dig a little and be sure there was blue ground under it, he would certainly have known that he was standing on top of a volcanic pipe.

"A volcanic pipe," Hartson Brant said softly.

Evidently Guevara had put a ring of men around the volcanic pipe and planned to hold it by force of arms.