Some diamonds are supplied with certificates.  These are called certified diamonds.  Normally a diamond will only be certified if it is over 1 carat.   If an item includes  a certificate it will be clearly stated in its description. 

We use a UK based company who specialise in Diamond and Gemstone Certification, Grading and Testing Service which is backed by the professional expertise and experience of the Birmingham Assay Office.

Please see "certified diamonds" below for further

information and examples of the certificates provided.