It is critical to the diamond trade that consumers are confident that the product is ethically sourced and manufactured and that the diamonds they purchase are free from undisclosed enhancements or treatments.


To reassure consumers that they are able to rely with confidence on the ethical standards of the industry, DTC requires that its Sightholders subscribe to a suite of Best Practice Principles.


Bpp - Best Practice Principles

In favour of:


  • Full disclosure of simulants, synthetics and treated diamonds
  • Diamonds from legitimate sources
  • Highest industry ethics
  • Compliance with local and international working standards
  • Fair treatment and dignity of individuals
  • Environmental best practice




  • Misrepresentation
  • Conflict diamonds
  • Child labour
  • Unsafe practices
  • Practices that harm the health and welfare of the individual
  • Illegal conduct


DTC have established a process of third-party verification of compliance by an impartial auditor and each of its clients has to submit an annual self-assessment which is audited by this third party who also conducts random on-site inspections at a prescribed number of client facilities. Breaches of the code can result in sanctions being applied or even loss of Sightholder status.  


An industry body, the Responsible Jewellery Council (RJC), set up with a similar goal, which has largely implemented this standard and are encouraging other mining companies and stakeholders in the industry to adopt this standard. 


Hennig, whilst maintaining the highest standards in all its commercial activities, also plays a role in disseminating any new requirements to the Sightholders and consulting with DTC on the practical issues faced by clients with their implementation.


Using both in-house expertise and our affiliate company BPC, Hennig assists clients in preparing self-assessment submissions and conducting checks prior to the third party audits.

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