A good proportion of jewellers’ diamond stock will not be certificated, however, they have been appraised and assessed for the ‘Four C’s’ that the jeweller is happy to sell.

It is important to know that there are a lot of non-certificated diamonds that are very good value. Just because they haven’t been assessed rigorously, doesn’t mean that they are not beautiful, legitimate or well worth buying.

If a Diamond does have a certificate (also known as a grading report, quality document or dossier) is a report produced as a result of a careful examination by a team of gemmologists. The diamond is scrutinized, measured and evaluated using precision tools of the industry is order to create a detailed analysis of its colour, clarity, polish symmetry and dimensions. A cut grade may also be included in the case of round diamonds.

The following institutes assess and certify Diamonds:

  • GIA (Gemmological Institute of America)
  • AGS (American Gemmological Society)
  • HRD (Antwerp World Diamond Centre)
  • IGI (International Gemmological Institute)
  • EGL (European Gemmological Laboratory)
Kings Lynn Branch

5 Norfolk Street
Kings Lynn
PE30 1AR

During Business Hours 9am-5pm
Phone: +44 (0)1553 774 499
0800 389 2860
Fax: +44 (0)1553 776 690