A certificated diamond is an individual diamond that has been assessed by an accredited gem laboratory. There are many gem labs in operation, but among the companies we use are GIA (Gemological Institute of America), IGI (International Gemological Institute), HRD and Anchorcert. These companies are considered to be the most respected and accredited diamond certification companies in the trade. A diamond that carries a certificate does not change the intrinsic nature of the stone or make it better quality. However, the certificate offers extra tangible assurances as to the particular nature & quality of the diamond you are purchasing. 

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