The 4cs


The purpose of a diamond certificate is to offer you the highest possible level of security and confidence. It confirms the diamond's authenticity and describes its essential characteristics or '4 Cs':

  • Color
  • Clarity
  • Cut
  • Carat

Not just anyone can grade a diamond. It needs to be examined by expert gemmologists, under strict regulations and using specialised equipment. DIA host  in-house experts apply the most stringent grading conditions.

DIA believes that all customers need to be informed correctly about the diamonds they buy. That is why DIA Diamonds Lab also examines whether a diamond has been subject to any unreported treatments in order to alter its appearance.
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