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Diamond Cut

The most common mistake people make is confusing the diamond cut with diamond shape. Diamonds are cut based on the nature of the raw stone. The angles and proportions have to be perfect for it to show its full potential on light reflection and refraction. Knowing how to tell a perfect cut from a mediocre one will help you pick the diamond that is better in its quality and value potential. A perfect cut of a diamond perhaps is the most important of the five c's it determines how brilliant the diamond will be. In a well-cut diamond light enters through the table and travels to the pavilion where it reflects from one side to the other before reflecting back out of the stone through the table and to the observer's eye. That light show for the lack of better words is what makes the diamond so flashing, and fiery and priceless.

The Diamond cut is typically graded as:
Ideal Cut
Ideal
Fine Cut
Fine
Shallow Cut
Shallow
Deep Cut
Deep

The Cut: In 1919 a young mathematician, Marcel Tolkowsky, wrote a Masters thesis on the proportions for round brilliant cut diamonds.
This became the basis for what is now known as the “Ideal Cut”.

Proportions of the Ideal Cut

An Ideal Cut diamond can only be on a round shape diamond. No other shape of a diamond can be an Ideal cut.

Well that’s great you might say but how does that help me? How will I ever know that the diamond I am looking at is indeed an Ideal Cut diamond? Well great question.

Here is the trick: You must only buy a diamond if it was certified by either an American Gem Society (AGS) or Gemological Institute Of America (GIA) Looking at their certificate will immediately tell you the cut grade of the diamond you are considering for purchase.

Sample Certificate issued by AGS

Sample Certificate issued by GIA