This African nation built its development on diamonds. Now it's crashing down

In a village outside Botswana ’s capital, Keorapetse Koko sat on an aging couch in her sparsely furnished home, stunned that a career — and an entire nation’s economy — built on diamonds had fallen so far, so fast. For 17 years, she had earned a living cutting and polishing the gems that helped transform Botswana from one of the world’s poorest nations into one of Africa’s success stories. Diamonds were discovered in 1967, a year after independence, an abrupt change of fortune for the landlocked country.