Members now represent about US$45 billion in relevant jewellery sales.
The Responsible Jewellery Council (RJC) has released its annual progress report for 2012, highlighting its achievements over the past year, which include the addition of 120 new members.
In 2011 the RJC’s membership grew 34%, with the organisation ending the year with 324 additional members, representing jewellery, diamond and associated supply chain companies in 30 countries.
It has said that its members represent about US$45 billion (£28bn) in annual relevant jewellery industry sales worldwide.
Last year the RJC welcomed 120 certified members, each having been independently audited against its Code of Practices, with companies including Harriet Kelsall, The Birmingham Assay Office and F. Hinds becoming UK-based certified members.
Michael Rae, chief executive of the RJC, said: “The  report acknowledges the continuing efforts of RJC members to enhance the integrity and reputation of the jewellery industry. The RJC and its over 370 members have made tremendous strides since the Council’s inception in 2005.”
In 2011 the number of RJC accredited auditors doubled from 119 to 228 auditors across eight firms, covering "nearly every region of the world".
Last month the RJC introduced its Chain-of-Custody (CoC) Certification, which will be available to RJC members who wish to provide their customers with independent assurance about conflict-free, responsible sourcing for gold and platinum group metals.
The CoC Certification has been designed to be used to support responsible mining practices, source legitimate recycled materials, identify the provenance of jewellery materials and avoid conflict resources implicated in human rights abuses, illegal or criminal practices.
The certification will go as far to enhance a certified company’s reputation through responsible sourcing and its response to the requests of customers at both a business to business and retail level.
At present the RJC has management teams located in Australia, Canada, Italy and the United Kingdom. It was founded in 2005 and is an international not-for-profit organisation bringing together more than 370 member companies working to promote responsible ethical, human rights, social and environmental practices in a transparent and accountable manner throughout the jewellery industry from mine to retail.