In 1967, the year after Botswana gained its independence from Britain, a huge diamond mine was discovered in a remote area called Orapa, about 250 miles from the capital city of Gaborone. The company that found the mine was De Beers, which was then — as it is now — the dominant seller of “rough stones” in the world. Four years and $33 million later, the mine was ready for production. Click to view news article on nytimes.com…