Did you know that diamonds are naturally formed within the earth, and that each one will likely contain some type of inclusion? Yep, it’s true. And, like snowflakes, no two diamonds will be exactly the same due to this inclusion. What is inclusion, you ask? 

What Is A Diamond Inclusion?

The inclusion is like a ‘birthmark’ for diamonds. Additionally, anything confined to the diamond’s surface is addressed as a ‘blemish’. Inclusions are formed due to the extreme heat and pressure experienced when forming diamonds.

Although inclusions are technically a flaw, it’s exactly what makes each diamond unique. People often mistake the black marks on diamonds as the only signs of inclusion. However, this is not the case. The black marks are actually crystals inside the diamond, consisting of carbon, which is a mineral. As a matter of fact, there are various types of inclusion within diamonds, some are made naturally – but not all.

You see, for each inclusion, there’s a distinct cause and subsequently a distinct effect on the diamond’s appearance.

Does Diamond Clarity Matter?

Diamond clarity is an essential aspect that you need to consider when looking for the ideal diamond. Inclusions are one of the most fundamental characteristics of diamond clarity

The larger the inclusions; either by size or amount, the lower the clarity grade will be. This is what you want to avoid. The team at Goldsmith Jewelers only carries the highest clarity diamonds and can help you make the best decision. Take a look at this list of the various types of diamond inclusions and how gemologists grade them.

What Are The Various Types Of Diamond Inclusions?

Inclusions don’t share a final result, knowing the different types can help you make a more informed decision.

  • Pinpoint inclusions – The most common type of diamond inclusion is the little, tiny black spots. Similar to blackheads, and are noticeable on the surface of a diamond.
  • Feather inclusions – After Pinpoint inclusion enters the Feather Inclusion, this one does have some characteristics of concern. Feather inclusions are small inner cracks that, if present from top to bottom, could in fact compromise the diamond’s durability.
  • Diamond Cavities – Diamond Cavities are the least common type of inclusion. It contains a modest hole within the diamond, similar to a cavity in your tooth. If you ever come across one of these— leave it and keep looking, as these are what’s known as “industrial grade” and are not utilized in jewelry.

How Do Gemologists Grade Diamond Inclusions?

The GIA and AGS apply strict guidelines when determining and identifying diamond inclusions. Factors that could impact its clarity grading, include:

  • Size of inclusion
  • Types of inclusion
  • Location of inclusion

Four Guidelines Reputable Gemologists Use:

  • First Priority – Ascertain the size of the inclusion to grade impact and clarity. 
  • Second Priority – Identify how many visible inclusions the diamond has. Multiple inclusions result in a lower clarity grade.
  • Third Priority – Location of inclusions. 
  • Fourth Priority – Determine if the inclusions are internal or external. External inclusions can reduce clarity grade. However, if there are no internal inclusions, the diamond can still acquire an Internally Flawless grade.

Do Inclusions Affect The Cost?

Remember that diamonds can be chipped or suffer a mishap during setting. Make sure to go to a professional jeweler like Kurt at Goldsmith Jewelers to choose your diamond, or to have your diamond examined prior to and preceding its setting.


Before purchasing a diamond, remember that inclusion matters, and every diamond is unique. If you’re in the market for some diamond jewelrycontact us today. Tina is excited to help you find what you need. In the meantime, take a look at our blog, over here.