The Witwatersrand once produced 40% of the world's supply of this precious stuff
..... 
6.485-million ounces in 2011, with platinum supplies from South Africa falling by
... [DOC] [TLE] SA diamonds languish in the rough | Business | M&G [PAR] Jun 14, 2013 ... De Beers, which controls 40% of the world's diamonds by value produced, ... the 
Southern African region producing 60% of the world's supply of the gems.