Group pulls out of process to guarantee diamonds do not come from conflict zones . Score: The `` conflict minerals '' are then laundered into the global supply chain by export houses , before being transformed into refined metals by large international smelting firms . 6 Thousands in countries such as Sierra Leone are used as slaves to extract diamonds . Global Witness : Kimberley Process has not shown itself capable of stopping trade .
Group pulls out of process to guarantee diamonds do not come from conflict zones . Score: 6 Thousands in countries such as Sierra Leone are used as slaves to extract diamonds . Global Witness : Kimberley Process has not shown itself capable of stopping trade .