Here’s a comprehensive list of common inclusion types found in a diamond. With the use of images and videos (photography credits – James Allen), I hope you get a better idea of how to identify them and understand the visual impact an inclusion may have on a finished diamond.

Bearding – Hair-like inclusions that form at the girdle area due to improper bruting processes. A heavily bearded girdle with a grey fuzzy appearance should be avoided.

Graining – Caused by irregular crystal growth. Internal graining can appear like whitish, colored or reflective lines. Depending on the severity, they can also appear like creases or give the diamond a hazy appearance.

reflective graining

Image credits: Vincent Cracco, © GIA

Cavity – This usually takes the form of a large or deep opening in the diamond’s surface. Cavities are usually created during the polishing process when an internal inclusion like a crystal falls out of its pocket. Read this article for more insights.

Crystals – Included minerals that exist within the body of the diamond. Depending on the type of minerals they are, they can be colorless (another diamond embedded with), black (carbon), reddish (garnets), greenish (peridots) and etc…  Since colored crystal inclusions are much more obvious to the naked eye, they are generally undesirable.

dark crystal inclusion

Crystals can exist in different kinds of shapes and colors.

Understanding clarity and a diamond’s inclusions is only a start towards learning how to buy diamonds. If you want to learn how to select the most beautiful diamond for your budget, you need to check out this proven step-by-step method that 1000s of other readers had successfully used.

Cloud – A cloud inclusion is a very broad term used to classify a cluster of pinpoints/crystals found very close to each other. Depending on the nature of the cloud inclusion, it can sometimes pose an issue to the diamond’s appearance.

For example, when clouds get too big in size and density, they can cause the diamond to take up a hazy appearance and negatively affect its light transmission properties. If they are small and diffused, it generally isn’t a cause for concern.

white cloud inclusion magnified at 10X

This dense and visible white cloud sets the clarity grade in this SI1 emerald cut.

cloud inclusions in diamonds
clouds that are dark

Varying intensities and coloration of cloud inclusions.

Without close up videos or photographs, there’s no way to determine how the diamond’s inclusions look like in real-life. That’s why I recommend readers to check out James Allen when shopping for a diamond.

Feather – A small crack or fracture within the diamond. Depending on your viewing angle, a feather can look transparent and almost invisible or it can catch on light and display a whitish appearance.

Severe feathers can cause durability issues (especially if they are surface reaching or near the girdle area) or have unsightly coloration to them; both of which should be avoided.

feather inclusion
brownish colored feather

On left: Due to the size and location of the feather, there is additional risks of chipping the diamond.
On right: A brownish coloration causes the feather to be very obvious to the naked eye.

Needle – A long thin needle-shaped (tiny-rod) inclusion that is usually white or transparent in color. If they appear in clusters, it might affect cause a detrimental effect on the diamond’s clarity.

needle inclusion in diamonds

Super obvious needle that runs across the middle of the stone.

needle inclusion in a pear shaped diamond

Small, transparent and elongated needle under the pear’s table facet.

Pinpoints – These are very small white or black crystals that are embedded inside a diamond.

barely visible white pinpoint

Can You See Faint White Pinpoint?

Twinning Wisps – This inclusion is a result of growth defects in a diamond’s crystal structure. During a diamond’s formation process, it may stop growing due to unfavorable conditions and twinning wisps are form when growth restarts (say for example thousands of years later) in a different direction.

In essence, twinning wisps are a mish-mash of different inclusions such as pinpoints, crystals, feathers and clouds that resembles a somewhat twirly plane.

twinning wisps in heart shaped diamond

Faint twinning wisp that can hardly be made out to the unaided eyes.


This video shows a heavily twinned heart cut with an I1 clarity.

Chip – A small opening on the surface of a diamond often found near the edges or facet junctions. This inclusion is typically man-made in the sense that it is damage caused by wear and tear or accidental knocks.


chipped diamond

badly chipped diamond


Indented Natural – A “flaw” which dips below the polished diamond’s surface. An indented natural is a part of the rough diamond that was left untouched during the polishing process and is usually found at the girdle.

indented natural at girdle

Indented natural indicated by red arrows. Source: GIA

So far, what I had shown you is a list of common inclusions found in a diamond. However, there are several clarity characteristics like etched channels or manufacturing remnants that are uncommonly seen and I have included the links here for the sake of completeness.

Moving on, did you know many shoppers actually make critical mistakes by selecting diamonds based solely on information from a grading report? The fact is, there are many hidden clarity related details that lab reports NEVER reveal to you. On the next page, I’ll show you why and how you can overcome the pitfalls of buying blind…

Next Page >>

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  1. Gina-
    October 1, 2015 at 5:51 am

    I lost my engagement ring after 15 years. I’m looking for a replacement diamond. Can you provide an opinion about this one? The photo is the actual diamond. It had been pulled off the site for now so some additional photos can be sent to me. I was a little concerned with the comments about clouds that are not mapped out.

    Overall, I’m seeking a roughly 1 carat (or in that ballpark). H or higher round brilliant or cushion cut with 1.00-1.05 l/w ratio. Budget is around $3700-ish.


  2. Paul Gian-
    October 1, 2015 at 9:27 am

    Please contact me via email directly as I would be able to address your concerns more appropriately.

  3. Ri-
    December 3, 2015 at 7:31 pm

    What does inclusion mean? Do we say for the crack also inclusion?
    What does flawless mean?

  4. Howie-
    December 29, 2015 at 7:22 am

    Hello Paul,

    I have been shopping around for a 0.95 carat SI1 diamond for a while. My theories are,

    1. for the diamond with features and without inclusion picture on the report, don’t buy because you don’t want to take a risk where is the feather.

    2. I have seen a diamond with many twinning wisps received SI1 grade. If I ignore the twinning wisps on that diamond, I think it deserve VS1 grade. So out of all different kinds of inclusion, twinning wisps are the most forgivable.

    Please tell me what you think…

  5. Paul Gian-
    December 29, 2015 at 3:39 pm

    You are over complicating things and misguided in your beliefs.

    Feathers usually aren’t an issue in small diamonds below 1 carat with SI1 grading. When diamonds undergo their polishing process, they are subjected to extreme conditions like high temperatures and force. Normal day to day conditions and activities are a far cry from that experienced during polishing.

    Clarity ratings are assigned by GIA based on factors like durability and inclusion location. So, a diamond with twinning wisps isn’t necessarily better than one with a feather. It depends on a case to case basis.

  6. Howie-
    January 5, 2016 at 11:23 pm

    Does GIA sort Clarity Characteristics based on how bad they are?

  7. Paul Gian-
    January 6, 2016 at 5:53 am

    The most severe inclusions are always listed first in the grading report.

    That’s to say, if you see something like this:


    The crystal inclusion would be the most significant and likely to be the grade maker of the clarity grade.

    If you see something like this:


    The knot inclusion is the most “severe” clarity characteristic in this case.

  8. Batsogile Keamogetse-
    March 23, 2016 at 10:54 am

    my colleagues and i have a misunderstanding on nature of a feather,i believe that the fact that its a ftr it will always go on the lower side of clarity when it comes to giving it clarity because it posses a durability issue,we had a feather on the table and we where caught between vs2 and si1,and based on the five factors number,relief,size,location and nature they gave nature vs2 because they say the feather is on the table not girdle but i belief nature has to be si1 because its a surface reaching inclusion not internal

  9. Paul Gian-
    March 23, 2016 at 1:31 pm

    It’s fine to have a discrepancy of one rating.

  10. Paul Gian-
    March 31, 2016 at 2:21 am
  11. Marcus-
    April 23, 2016 at 2:29 am

    With a proposal in my very near future, the info on your website has been extremely helpful and informative.

    Would you mind giving me your opinion of these three diamonds, please?

  12. Abhishek Gautam-
    June 22, 2016 at 5:36 pm

    Paul, I am in the market to buy a ~1.5 cw diamond. The cut I am looking for is Signature ideal, Color “G” and VVS1. I found the following diamond on Bluenile. Can you please let me know if it looks good to you for the price or would recommend anything else?

    Thanks for your help!

  13. Paul Gian-
    June 23, 2016 at 4:09 am

    This BlueNile Signature stone looks like a decent choice.

  14. Benjamin-
    July 6, 2016 at 6:34 pm


    I’m intrigued by this oval cut as it meets my desired specifications and budget; however, after viewing the GIA report I am concerned that the amount of clouding will impact the light transmission.

    Based on the amount of clouds and their location, what are your thoughts on light performance?

  15. Paul Gian-
    July 7, 2016 at 3:17 am

    Read every single word in this article:

  16. Tanya-
    July 17, 2016 at 3:47 am

    Hi Pual, can you please clarify that what is the worst defect inclusion in diamond which has the same clarity grade.
    Let say between four of this; crystal, cloud, feather, needle.
    Thanks and brdgs

  17. Paul Gian-
    July 18, 2016 at 2:50 pm

    Depends on clarity grades and case by case basis. For example, a small feather is not necessarily better than a dark colored needled.

  18. Luke-
    August 5, 2016 at 11:25 pm

    Hi Paul,

    Big fan – thanks for providing us with all this information, it’s making this process a lot less stressful.

    After careful selection I blocked this stone for in-store review, and I’d love to hear your opinion about it:

    The HCA score is 0.7 and cut is the most important measure for me. I already requested ASET scans / videos / HD images, but I’d love to hear your input about it.

    Thank you so much!

  19. Natasha-
    August 21, 2016 at 10:44 am

    Hi Paul

    I am looking to buy a 0.50cish diamond for $1,500-$2,500AUD inc taxes. Everything I have read has told me an excellent cut is a must have. Would the following stone be a good choice? I am concerned about the durability/eye cleanliness due to the placement of the feather:
    Appreciate your help!

  20. Paul Gian-
    August 21, 2016 at 1:11 pm

    The placement of the feather (at 4 o’clock) at the girdle area isn’t a concern. Generally, diamonds only have significant durability issues IF they are graded at I1 or lower at half carat size.

  21. October 5, 2016 at 6:14 pm

    What is your opinion of Black by Brian Gavin?

  22. Paul Gian-
    October 6, 2016 at 1:13 am

    It’s a series with exceptionally well cut diamonds. Slightly pricey because of brand premiums though.

  23. mark-
    October 7, 2016 at 12:10 am

    Hey Paul I’ve read numerous reviews that you’ve written. I’m trying to find a diamond on Ritani.. yes I read the review but i’m in Canada and it seems like a good place to start.

    Please email me if you have time i have numerous questions i need help with. i could really use your expertise.


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