[R]esults of a national survey released…by the [World Diamond Council] reports that 88% of the jewelers had asked for or received guarantees from their suppliers that all their diamonds are conflict-free…89% said they had trained their staff to handle customer questions…while four out of five said they felt confident of their ability to explain the…Kimberley Process... The legitimate diamond trade is…essential to the prosperity of countries like Botswana, Namibia, South Africa, and Tanzania.