Diamond Inclusions: Feather, Crystal, Cloud, Cavity, Knot

The Different Diamond Inclusions

When grading diamonds according to the diamond grading chart, inclusions are one of the two characteristics of diamonds that need to be checked and assessed. Inclusions are referring to the flaws inside the diamond. These are carefully identified in each diamond by skilled diamond graders.

It is important to become familiar with the different inclusions that can be found inside diamonds. Having basic knowledge with how diamonds become more valuable and have high quality is essential to all diamond lovers as they could attain their ideal diamonds.

As defined geologically, inclusions are defined as any crack or foreign object that trapped inside the diamond. Foreign object could be in solid, liquid, or gas formation. Below are the most commonly known diamond inclusions:

Crystal and other mineral
Crystals and/or other minerals are considered as the natural inclusions found in gems especially in diamonds that vary in color, shape, size, and position. Most of included crystals are in dark color that has impact with the brightness and appearance of diamonds especially in lighting conditions.

Feather
Generally, feathers are inclusions that pertain to any breaks in the diamond. Some types of breaks are cleavage and fracture. Cleavage is a break in the diamond that occurs in a cleavage plane (breaks in one or more octahedral planes) while fracture is break found in other direction of a diamond. Most breaks are in feather-like shapes that look either shiny and white or glossy and transparent depending on the viewing position.

Cloud
Clouds are tightly grouped pinpoints found inside the diamond. Pinpoints are inclusions that are in form of very tiny dot in which usually seen under a ten times (10-x) magnification. Most often in white color but sometimes could be dark.

Needle
Needle is an inclusion that is in form of thin and long crystal seen under 10-x magnification. Its color could be in white, bright, or dark depending on the position of the viewer.

Cavity
The space left inside the diamond is called as cavity. This is usually occurs during polishing of diamonds. Also, when part of a feather (an inclusion) breaks away that leaves deep, angular opening will result to cavity.

Knot
After the process of cutting and polishing, another man-made inclusion that can be formed is knot. When viewing in a 10-x magnification with good lighting, the included knot has boundary to the diamond itself. It could be in rectangular shape and the sides are drag lines.

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