By John J. Gurney, Alfred A. Levinson, and 11. Stuart Smith
By John J. Gurney, Alfred A. Levinson, and 11. Stuart Smith A vast resource of gemqnality diamonds exists off the west coast of southern Africa. Over the course of millions of years, many diamondbearing kimberlite pipes in the Orange River drainage basin have been extensively eroded and the released diamonds transported to the west coast.