Diamond Cut Grade

Diamond Cut

Leading gem laboratories such as the Gemological Institute of American (GIA) and the European Gemological Laboratory (EGL USA) grade diamonds according to the quality of their cut. They are graded on a scale from "poor" to "excellent". The diamond chosen for your engagement ring should at least have a grading of "fair".


At Solomon Brothers, we use our state- of- the-art OGI Firetrace analyzer to ensure superior accuracy as we assess each diamond. This instrument gives us a sophisticated, computerized analysis that measures the diamond, mathematically simulates its light-reflecting properties, and determines how much "life" is in the stone. With our OGI Firetrace analysis, you know the exact properties of the diamond you are considering.

  • Excellent (Ideal) – An ideal diamond will display the maximum amount of reflected light. Because symmetry plays such an important role, only "round" diamonds (as opposed to specialty shapes) can be graded as "excellent".

  • Very Good (Nearly "ideal") – These diamonds reflect up to 90% of the light that enters them. They are exceptionally well-cut diamonds creating an exquisite stone.

  • Good – Because these diamonds still reflect a good portion of the light that enters the stone, they make very attractive engagement rings.

  • Fair – These stones will reflect approximately 40% of the light that enters. While the size of the diamond can mean good value for money, the stone will lack high brilliance.

  • Poor – Although less brilliant than other diamonds and therefore not recommended for engagement rings, these still create a lovely effect in earrings and pendants and often represent excellent value.

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