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Perhaps the 5th ‘C’ when purchasing a diamond is the CERTIFICATE or diamond report. This importan. document validates the diamond’s characteristics. A diamond certificate from a ‘no name’ laboratory or jewellery shop is not worth the paper it’s written on, insist on quality gradin. documents. The world’s foremost diamond report and the leaders in diamond research are the inventors of the ‘4C’s ’; the GIA (Gemological Institute of America).
There are other laboratories that also use the GIA methods and/or have a very good reputation, they are:
GIA (Gemological Institute of America) - http://www.gia. edu/
AGS (American Gemological Society) - http://www.ags. org/
HRD (Antwerp World Diamond Centre) - http://www.hrd. be/
IGI (International Gemological Institute) - http://www.igiworldwide.com/
EGL (European Gemological Laboratory) - http://www.eglusa.com/DG no longer sells E. G. L certificated diamonds
The above diamond grading laboratories are the largest, probably the strictest and certainly and most well known of the international gemological centres. There are subtle differences in grading techniques but the overall consensus is usually very close between these institutions.
Any other diamond report may warrant further analysis of the laboratories processes and ability to grade in a consistent and unbiased manner that represents a true and fair diamond report. because the diamond certificate reports the characteristics of the diamond its vital and imperative it comes from a reputable source.
A diamond valuation or appraisal is significantly different from a diamond report or certificate and should not be confused. ALWAYS insist on a diamond certificate from a major laboratory!
Remember that when buying a diamond there are many characteristics that need to be balanced and reviewed in order to buy quality within your budget. Every certificate from any lab. will carry its own disclaimer, this from an E. G. L certificate is typical:
‘This examination has been carried out using the current gemological procedures of E. G. L.
The report or seal expresses an opinion at the time of inspection of the stone, not a guarantee, valuation or appraisal. No representation or warranties as to accuracy are made. Diamond grading is not a science; It represents only the best professional opinion of this company [the EGL], which chooses its own standards or norms. A+/- 20% error of judgement is scientifically possible. E. G. L. is expressly held harmless by customers including, but without limitation for any claims or actions that may arise out of negligence in connection with preparation of this laboratory report or seal, or actions based upon the customer’s use of the certificate or seal’
ComparetheDiamond.com (formerly diamondgeezer.com) stresses the following poignant points from this:-
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