Most diamond dealers, they refer to themselves as diamondaires. Most diamond dealers - international diamond dealers - will tell you that if they receive a parcel of diamonds from Sierra Leone, only Sierra Leonean diamonds, they would probably be able to identify it as such. If they received a parcel of diamonds from Namibia they would probably be able to - they would probably be able to identify it as such, but once the diamonds are mixed - once any mixing takes place - they lose track of it. They can't pick a diamond out of a mixed parcel and say, "This one came from Sierra Leone", or that it came from Namibia, or South Africa. It might be similar to diamonds that came from one of those locations, but they can't really say with any assurance. There are a number of experiments and technologies that are being investigated that could better identify the origin of diamonds, but a professional diamond dealer in most cases cannot tell you where the diamonds in a mixed parcel came from.