In recent years, African diamonds have lost much of their lustre. The ruthless hunt for so-called blood diamonds delivered little more than brutal civil wars and misery upon that continent, no more so than in Liberia, which is still recovering from years of conflict. But when Hillary Clinton touched down there on her African tour this week, she cited another nation, Botswana, as a role model for dealing with the precious stones. As Ginny Stein reports, a massive diamond deposit appears to be a godsend for the once sleepy country. REPORTER: Ginny Stein For over 40 years in an arid,...