All About Diamond Cuts

Author: Simon Wiser

So, you are in the middle of your research for buying engagement rings.
You have encountered the “4Cs” of diamonds which you understand is how diamonds are graded.
You understand Carat, Color and Clarity, but have encountered Cut.
You thought that Cut was the shape of the diamond, but now you are seeing figures and percentages to do with Cut. So, what is it?

Well, the diamond cuts can relate both to the shape of the diamond, and the way the diamond is proportioned.

Diamond cuts can be round brilliant cut, princess cut, cushion cut, oval cut, emerald cut, marquise cut etc etc. In other words, the actual SHAPE of the diamond.

At the same time, diamond cut can also refer to the way the diamond is proportioned, and the relative measurements associated with that.

All Diamond Cuts Are Not Equal


The GIA only started to assign cut grades to diamonds in early 2006….and that was for round diamonds only. It can be confusing when visiting certain websites, and you

are presented with cut grades for all the shapes of diamonds. However, you can rest assured that the cut grade will probably have an asterisk next to it, referring you to the line of “this cut grade is provided by RETAILER to guide consumers”. In other words, the web retailer has looked at the diamond, seen it hasn’t got a cut grade on the diamond certificate, looked at the way the diamond is proportioned, and has assigned their own diamond cuts grade.

Misleading, yes to a certain extent. Because this cut grade will not appear on the diamond certificate.

Let’s assume therefore that you are interested in a diamond which has no cut grade. There are certain indicators on the diamond certificate which give you an idea of how the diamond is proportioned, so if there WAS a cut grade for the diamond, then you can pretty much work out what this would be. As you can appreciate, factors such as the symmetry, depth and table all work hand in hand with each other, and it is the combination of these three factors which will ultimately determine the overall cut grade.

The depth and table measurements differ by diamond shape. Below are the IDEALS. The further you move away from these parameters, the less well the diamond cuts, the less brilliance and sparkle from the diamond and, therefore, the less valuable the diamond.

Diamond Cuts Options

ROUND BRILLIANT CUT – Depth 58-63%, Table 53-60%
PRINCESS CUT – Depth 64-75%, Table 60-71%
EMERALD CUT – 60-65%, Table 60-64%
OVAL CUT – Depth 59-63%, Table 54-61%
MARQUISE CUT – Depth 59-63%, Table 54-61%
PEAR CUT – Depth 59-63%, Table 54-61%

Obviously, if the diamond has a FAIR symmetry grade, then the chances are that it won’t be assigned an EXCELLENT diamond cuts grade.

If you find a diamond which doesn’t have a cut grade assigned to it, then it would be worth speaking with your diamond specialists.

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There are lots of beautiful diamond cuts and Moseley Diamond Showcase is here to serve you in your search for the perfect diamond cuts.