The process was set up to grade Diamonds
The Kimberley Process Certification Scheme (KPCS) is the process established in 2003 to prevent Conflict Diamonds from entering the mainstream rough diamond market by United Nations General Assembly Resolution 55/56 following recommendations in the Fowler Report - wikipedia 
ensure that diamond purchases were not financing violence by rebel movements and their allies seeking to undermine legitimate governments.
Diamond miners in Sierra Leone
- wikipedia 
The effectiveness of the process has been brought into question by organizations such as Global Witness, which pulled out of the scheme on 5 December 2011, claiming it has failed in its purpose and does not provide markets with assurance that the diamonds are not conflict diamonds.