Diamond Proportions

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Depth Percentage – The depth of a stone measured from the table to the culet. It is expressed as a percentage of the stone’s diameter at the girdle.

Table Size – The size of the table of a fashioned diamond is expressed as a percentage of the stone’s narrow-girdle diameter. On a round brilliant, it is measured from corner to opposite corner, rather than from flat side to flat side.

Ratio : Is referred to the overall diamond in LENGTH to WIDTH.

Girdle – The outer edge, or periphery, of a fashioned stone; the portion that is usually grasped by the setting or mounting; the dividing line between the crown and pavilion.

Diamond Properties Diagrams

Diamond Properties


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Should Your Diamond Have a Culet?

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Should Your Diamond Have A Culet?

This is a question often asked.

Which is better? Having a culet, or not having a culet?

Is one better than the other? Let’s have a more in depth look at culets.

What is a Culet?

A culet is the very bottom point (tip) of a diamond. This is where all the facets of the pavilion (base of the diamond) meet up. In easy terms it is the pointy end of the diamond.

The culet is the name of the facet that is left behind when the diamond cutter cuts that point off. The culet becomes an octagon facet parallel to the table (top flat part of the diamond).

Here is a diamond culet diagram:

Diagram Culets

Culet Cuts and Facets

There are 8 different types of culet facets. Most of the grades are good or excellent.

Only when you get into large, very large or extremely large culet sizes does it start to affect the look of a diamond.

A large culet will make it look like the diamond has a hole in it.

The 8 different grades of culets are:

  1. None = excellent
  2. Very small = excellent
  3. Small = excellent
  4. Medium = very good
  5. Slightly large = good
  6. Large = good
  7. Very large = fair
  8. Extremely large = poor

The Best Culet to Have

The best type of culet to have is anywhere from no culet, to a medium culet.

You can see what type of culet you have by checking out a diamond certificate (like a GIA certified diamond).

Even when the diamond has no culet, it is still listed with a culet: culet = none.

Having “No Culet” is considered excellent. So is “very small” and “small”.

If “no culet”, very small culet and small culet is considered excellent, does it matter if you choose one over the other?

It is a matter of opinion but generally it does.

The point of a culet

The reason a diamond has a culet is simple: it’s to prevent chipping or breaking. The diamond tip is fragile and can easily be broken if it gets bumped or hit.

This is why the tip is removed. It prevents the diamond from chipping.

Is One Better Than the Other?

Is having a small culet better than not having one? Sure! Why risk chipping a diamond if you don’t have to.


It’s not Worth the Risk

Let’s say you buy a beautiful loose diamond (the only way to buy a diamond is loose) with a top of the line color and clarity. It’s also certified by the best there is: GIA. You decide to have the diamond set into a tiffany style engagement ring. But, during the setting process, the jeweler accidentally pushes the diamond too far into the head (this holds the diamond in place) and chips the end of the diamond.

Chances are good that the jeweler won’t realize he did it either, and unless you microscope your diamond when you pick it up, you won’t know as well. This is not good, especially as the diamond has lost its value.

A Small Culet is Ideal

Having a small culet is the best culet to have!

As far as the diamond certificate goes, small culet or no culet will be graded the same (excellent), but for protection and peace of mind, having a small culet is much better than having no culet.

That is all the information you will need on Diamond Culets.

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