Here's a great video of the Namib and the diamond mine history on Youtbe, three parts , 20 megs each.... here are the links.
http://www.youtube.com/watch?v=Ayh48FGlPUg&feature=PlayList&p=940CEDB5F7DF7986&playnext=1&playnext_from=PL&index=2
http://www.youtube.com/watch?v=cga-52C0AIo&feature=PlayList&p=940CEDB5F7DF7986&playnext=1&playnext_from=PL&index=1
http://www.youtube.com/watch?v=r7lM1F8QkTc&feature=PlayList&p=940CEDB5F7DF7986&index=0&playnext=1