The Working Group of Diamond Experts (WGDE), also referred to as the technical working group, solves technical problems in the implementation of the Kimberley Process Certification Scheme.

Examples of the type of work it does are: proposing changes to the ‘Harmonised System Codes' for rough diamonds to the World Customs Organisation; the classification of diamond powder; harmonisation of valuation methodologies; and the international transfer of diamond samples from exploration projects.

In specific situations, such as Cote d'Ivoire, the Democratic Republic of the Congo, Ghana and others, the technical working group also delivers background technical information to other Kimberley Process bodies or international organisations.

Chair World Diamond Council  
Vice-Chair Namibia  
Members Australia, Botswana, BrazilCanada, the People's Republic of China, the Democratic Republic of Congo (DRC), European Union (EU), GhanaIndia, Israel, Lesotho, Liberia, the Russian Federation, Sierra Leone, South Africa, Tanzania, the United Arab Emirates, the United States of AmericaUkraineZimbabwe, the Civil Society Coalition  
Provisional Angola  
2019 The Civil Society joined the WGDE.  
2018 Lesotho was accepted as full member of the WGDE after one year as provisional member  
2016 Tanzania was accepted as full member of the WGDE after one year as provisional member  
2013 Ukraine joined.  
2012 Brazil and Zimbabwe joined.  
2011 Ghana and Namibia joined.  
2009 the Democratic Republic of Congo (DRC) joined.  
2007 Liberia, Sierra Leone, the United Arab Emirates, and the the United States of America joined.  
2003 India and the People's Republic of China joined.  
2003 Established: World Diamond Council, South Africa, Australia, Botswana, Canada, European Union (EU), Israel, the Russian Federation.