The Foundry Journal

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The Anatomy of a Round Diamond

Jul 07, 2015 BY Diamond Foundry IN Style Guide

As you may have noticed, buying a diamond comes complete with a heaping pile of intricate facts and details that only make sense to industry insiders. Facts like, “a modern round brilliant diamond has 57 facets plus the culet. The faceting pattern for a round brilliant is fairly standardized, so the degree which each facet conforms to the ideal determines the cut grade.” Or “fancy cut diamonds, like cushion or heart cuts,  have a wide variety of pavilion faceting patterns, each of which produces a different effect of brilliance and scintillation.”

Frankly, it is hard to keep up with all the insider talk. Luckily, we are here to help with these handy diagrams! Use the graphics below to help remember what those fancy gemologists mean when they are talking about the different aspects of your diamond.

In this post, we are going to cover:


The Crown’s Facets

The Pavilion Facets

And Proportions

The Crown’s Facets

The crown is the portion of the diamond above the girdle.


The table is the uppermost facet on the diamond. It is also the largest facet.

The upper girdle facets sit just above the girdle. They are the lowest facets on the crown of the diamond.

The bezel facets are the kite shaped facets whose uppermost points touch the table and whose lowermost points touch the girdle. They are in between the star facets and the upper girdle facets.

The eight triangular facets that surround the table are called the star facets.

The widest part of the diamond, the girdle can have a slightly waxy appearance, or be faceted. It is important that a diamond’s girdle not be too thin or it might chip, nor too thick or it will add weight to the diamond without increasing its value.


The Pavilion’s Facets

The pavilion is comprised of the lower bezel facets and the pavilion main facets. In plain terms, the pavilion is the lower half of the diamond.


The pavilion facets extend up from the culet.

The point at the very bottom of the diamond, the culet may or may not be faceted.

Facets extending down from the girdle of the diamond, in between the pavilion mains, are the lower girdle facets.



These are the measurements and angles that determine a round brilliant’s “cut” grade, and are found on most diamond certificates.



It is’nt possible to accurately measure these proportions by hand, they are automatically determined by specialized systems that use a high resolution digital camera for the 3D modeling of the diamond.

A Sarine Diamond DiaMension Scanner


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