The Diamond 4Cs: Certificate

Art. 224

The quality and value of a diamond are based on a well-established and worldwide recognized grading system: the 4Cs (color, clarity, cut, and carat weight). There is a 5th C that is just as crucial as the 4Cs when you are buying or selling a diamond: the Certificate, also known in the trade as the Diamond Grading Report.

A diamond grading report is a document that attests the authenticity and the quality of the diamond you are purchasing or selling. It describes whether your diamond is natural or synthetic, if it has been treated to enhance color and/or clarity, and evaluates each of the critical quality factors affecting the diamond’s value: the 4Cs. 

To be reliable and internationally recognized, the diamond grading report should be issued by an independent and trusted gemological laboratory with trained gemologists that use precise and universally accepted standards to judge and assess the diamond 4Cs. Diamond grading reports issued in America by the GIA (Gemological Institute of America) are among the most recognized and widespread worldwide. Diamond grading reports from other gemological laboratories are also trustworthy, like, for example, those issued in Belgium by the International Gemological Institute (IGI) and the Hoge Raad Voor Diamond (HRD), and in Switzerland by the Gubelin Gem Lab and the Swiss Gemological Institute (SSEF). The reputable laboratories issue diamond grading reports only for loose stones because the mounting of jewels almost always makes it difficult to assess the 4Cs as accurately or consistently as for loose stones. It is possible only to estimate the diamond quality factors for mounted diamonds. 

A diamond grading report should always accompany every diamond of one carat or more. It is not only a vital trade tool to understand the quality and value of a diamond but is also helpful to compare and evaluate the quality of different diamonds. Diamonds that apparently are similar may have completely different prices. The key for price differences is the 4Cs of the diamond and how they combine because color, clarity, cut, and carat weight always work together to determine the overall diamond’s beauty and value. However, when you are buying diamonds for a jewel, it is essential to place more focus on the way a diamond actually looks instead of just relying on the numbers and parameters described in the diamond grading report. A diamond can be more attractive than its quality factors suggest in some instances. The important thing is that people know what they are paying for and a diamond grading report, when used correctly, provides to them all they should know for a confident purchase.

December 20 2021