• Noel Finan

The low-down on diamond cut

Updated: Mar 5

While cut is considered the most important aspect of a diamond, don’t be fooled by high street stores that try to bamboozle you with buzz words, different grading terminology and extraneous detail.






Quite simply, diamond cut refers to how your diamond is made – the cut itself, its symmetry and polish.


These three aspects determine how well your stone reflects the light to give that brilliant sparkle diamonds are renowned for.


A diamond with a poor cut looks dull and lifeless, and when cut too deeply can appear smaller than it really is.


Comparatively, a well-cut diamond will dazzle, appearing bright, vivid and intense, and can give the illusion that it is larger in size than other diamonds of the same carat.


Your diamond’s cut is appraised according to three grades: excellent, very good and good.

Ideally, each aspect of your diamond’s make should achieve a rating of Excellent, or a mix of Excellent and Very Good.


A rating of Good – quite frankly – is just not acceptable and describes a run-of-the-mill diamond that isn’t deserving of your hard-earned cash.


But here’s the lowdown the high-street stores won’t tell you: Only the round brilliant cut diamond can achieve the Excellent rating across all three aspects of a diamonds make – irrespective of their size which is classified as a Triple X rated make.

When it comes to any other diamond shape, despite all our technology and modern appraisal methods, it is just not yet possible for the laboratory to assess how well cut the diamond is.

To maximise your budget, keep these tips in mind when thinking about cut:


  • Your diamond cut grade should only ever be Excellent or Very Good to guarantee the sparkle you deserve.

  • Despite however flawless your diamond’s clarity may be, if the diamond has a poor cut it will appear dull and lifeless.

  • Despite however flawless your diamond’s clarity may be, if the diamond has a poor cut itwill appear dull and lifeless.a larger diamond when compared to other stones of the same carat.


Now that you understand cut, the next in my blog series discusses shape, where I will let you in on a little trade secret that will help create the illusion of a larger stone!


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