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Diamond Anatomy

March 1, 2016/ BY Coster Diamonds

Diamonds might come in all shapes and sizes, but they still have a lot in common. Namely, all diamonds have a certain number of physical characteristics, or in other words, they have a certain anatomy. This refers to the parts of a diamond, which are roughly divided into three groups: Crown, Girdle, and finally – Pavilion.

We’ll start with the middle one – the Girdle – as it’s easier to grasp the anatomy of a diamond in this way. Girdle is the outer edge of a diamond, that thin middle section that’s sometime least noticeable on a gemstone. This part of a diamond can be faceted, or it can have a smooth finish.

Figure 1 – Girdle

Now, let’s move upwards. The upper portion of a diamond, which sits above the Girdle, is called the Crown. However, the crown is not simply a uniform section. This part of the diamond consists of four additional components, and those are Table, Star Facets, Bezel Facets, and Upper Girdle Facets. The Table is the very top part of the diamond which, as you can imagine, is completely flat. Another defining characteristic of the Table is that it runs parallel to the plane of the Girdle.

Next, we have the facets. The Star facets are located right next to the table, and these have a very important role of directing the light that goes into the diamond. The Bezel Facets also direct the light, and what makes them particularly interesting is that they’re shaped like kites. Last, but not least, we have the Upper Girdle Facets. As their name suggests, these are located right next to the girdle. They are also the lowest facets in the crown.

Figure 2 – Crown

The part of diamond that’s below the girdle is called the Pavilion. Again, this part has its own constituents. The first one is the Lower Girdle Facets. These are similar to the Upper Girdle Facets, however, they are found below the girdle. This part of the diamond redirects light that enters the diamond, sending it back to the crown. Complementing this are Pavilion Facets, which are adjacent to the culet, the final consentient part of a diamond (or the first one, if you happen to be looking at the diamond upside down). Again, the Pavilion Facets redirect the light back to the crown. This is all completed with the culet, sitting at the bottom of the pavilion.

Figure 3 – Pavilion

When discussing the anatomy of a diamonds, one must also take into account some key measurements, starting with the diamond’s length and width. Both are stated in millimeters, but the numbers themselves are not the only thing that matters – it’s their ratio that’s important as well. The latter is calculated by dividing the length by the width. A diamond whose length and width are exactly the same (so, either a perfectly square or round diamond) will have an L/W ratio of 1. Next, we have the Girdle Width, and depending on this measurement, diamonds are classified on a special scale ranging from Extremely Thin to Extremely Thick. Finally, we have the Culet Size. The Culet itself can be a single point, or even a small facet.

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