De Beers Reboots Hunt for Africa’s Elusive Diamonds – Wall Street Journal

KALAHARI DESERT, Botswana—Crouching in the sun-scorched sand, De Beers geologist Charles Skinner picked up an ashy, white cylinder of rock and looked for shimmering evidence that an ancient volcano was sitting below his feet, containing billions of dollars’ worth of diamonds.

Mr. Skinner is at the vanguard of a new effort by diamond merchant De Beers to uncover the first major diamond mine in at least 20 years. De Beers last year…