List of Natural Diamond Inclusions

The clarity of a diamond is determined by the absence of inclusions and blemishes. Inclusions are the internal or surface reaching characteristics in a diamond that are formed during the diamond formation. Inclusions are described by their shape and appearance. This helps in understanding the clarity grade better as well as creating a diamond plot for grading reports and certificates.

Below is a list of different types of inclusions:

  1. Pinpoints

These are small microscopic crystals that resemble tiny dots. 

Diamond Pinpoint Inclusion Clarity Grading GIA
  1. Clouds

A group of pinpoints is called a cloud. At times if there are a lot of pinpoints in the cloud, it can cause the stone to have a hazy appearance. 

Diamond Knot Cloud Grading GIA
  1. Feather

A feather is an internal-inclusion that is a crack within a diamond that resembles a feather when viewed at a certain angle.  Often feathers are white inclusions. Feathers are not a reason to reject a diamond outright.  There are at times when a feather can affect durability, but that is rare and on a case by case basis.

Diamond Feather Clarity Grading GIA
  1. Crystals

Sometimes during the diamond formation, minerals from the surrounding environment get entrapped. Crystals can come in any shape and color. 

Diamond Crystal Clarity Grading GIA
  1. Knot

A knot is a crystal that reaches the surface of the diamond or is close to it.

Diamond Knot Clarity Grading GIA
  1. Needle

A needle is a crystal that resembles a needle-like shape. These look like narrow rods.

  1. Cavity

A cavity is a gap or a hole in a diamond caused either while polishing due to an inclusion. It may also be present due to the removal of a surface-reaching inclusion.

Diamond Cavity Clarity Grading GIA
  1. Twinning Wisps

Twinning wisps are elongated inclusions that consist of a group of pinpoints, needles, clouds or crystals. 

Diamond Knot Twinning Wisps Grading GIA
  1. Laser Drill Hole

Sometimes to improve clarity, laser beams are used in a diamond that can leave a tiny hole behind. 

Diamond Laser Drilled Hole
  1. Internal Laser Drilling

Sometimes inclusions might be dark in appearance. Diamonds are internally drilled so that the impact of the laser creates a surface-reaching feather that can easily provide a way for bleach to reach the inclusion and improve the appearance. 

Diamond Internal Laser Drilling Clarity Grading GIA
  1. Internal Graining

You might notice certain lines or angles or curves while tilting a diamond. These can be whitish or reflective and are formed due to irregularities while diamond formation. 

Diamond Internal Graining Clarity Grading GIA
  1. Bearded Girdle 

Due to the cutting and polishing of diamond, small hair-like feathers can be formed near the girdle. A heavily bearded girdle will look fuzzy in appearance. 

Beared Girdle Diamond Clarity GIA
  1. Indented Natural 

Sometimes you will notice a part of natural diamond rough that stretches into the polished diamond. This is left behind deliberately by the cutter. Most often these are found near the girdle.

Diamond Clarity Indented Natural GIA Grading