The cut of a diamond should not be confused with its shape. Shapes are cut from the original rough diamond and whatever the shape, a well-cut diamond will always be able to reflect light better.

Cut Is About Proportions

The brilliance (light return), fire (dispersion of light) and scintillation (sparkle) are hugely dependent on the cut of the diamond. It is the only aspect that is directly influenced by man. When a diamond is cut to the right proportions, light is reflected from one facet to another and then dispersed through the top of the stone.

How Are Cut Grades Assigned?

Diamond cut grades are assigned as per the diamond cut grades established by the Gemological Institute of America. They are only provided for Round shapes. Diamonds assigned ideal, excellent or very good cut grades are considered well cut. Other cuts that prevail are good, fair or poor cut.

Top Tips

To help you choose the perfect diamond Cut, we have collated a few top tips

Cut has more effect on sparkle in higher carat weight compare to lower.
For superior brilliance, choose a diamond with a Cut grade of Good or better for round diamonds, and very Good or better in fancy shape diamonds. Cut of the diamond also affect the size of the diamond. Mainly princess shape diamond can very more in size from lower to higher cut grade.

How Light Passes Through The Diamond 

Please view the diagram below, which illustrates how light passes through different types of cuts.

Diamonds Cut

Types of diamond cut:

  •  Ideal or Excellent Cut
    A very rare and excellent quality diamond. Diamonds with ideal or excellent cut reflect almost all the light that enters.


  •  Very Good Cut
    The light reflected is nearly the same when compared to ideal or excellent cut diamonds, but attracts a lower price.


  •  Good Cut
    Good cut reflects most of the light that enters. Such diamonds are available at a lower cost and thereby make it a
    more affordable option compared to ideal or very good cut diamonds.


  •  Fair Cut
    A fair cut diamond typically reflects a small portion of light. This cut is still considered to be a better quality of diamond. These
    diamonds have been cut to maximise the carat weight over most other considerations and are therefore better value for money.


  •  Poor Cut
    This diamond cut is generally a diamond that has been cut too deep or too shallow. When this occurs the
    diamond will lose significant amounts of light. A major benefit of this type of diamond is the price. A diamond that is a
    poor cut will be significantly lower inprice than any other diamond cut grade.


Using Independent Certification

If you're looking to specify a particular type of cut, you can ask for an IGI/GIA option which will allow you to narrow it down to exactly which cut quality you require.

Get In Touch

If you'd like to talk to an expert gemologist about our diamonds, or a member of our friendly Customer Care Team, please get in touch on 888-888-3959 888-888-3959 or enter into a Live Chat as you prefer.