Because natural diamonds are produced from nature, it is inevitable that some impurities will enter the diamond during the formation process, which forms imperfection in a diamond. But when we buy imperfect diamonds, how much do you know about flawed diamonds? This article will be your best buyer’s guide.

What does imperfection in a diamond contain?

Imperfection in a diamond generally refer to those natural impurities or defects present in the diamond. It can be internal impurities, or it can be the diamond itself missing a corner or a small part. Imperfection in a diamond usually have a significant determining effect on the beauty and value of a diamond.

How many types of Imperfection in a Diamond can be classified into?

Apart from possible imperfections and chips in the diamond itself, imperfection in a diamond can be divided into two categories according to the location of the imperfection: internal imperfection and external imperfection.

Imperfection in a Diamond- Internal Types

Here explained 15 types of internal characteristics of imperfections in a diamond.


Bruise usually appears under a magnifying glass as a set of small, x – like cracks. The imperfection, which is usually small, is a tiny crack or damage caused by external pressure or impact and usually occurs on the inside of the diamond near the surface.


Cavity is an imperfection in a diamond that has formed inside a diamond in the shape of hole. This type of flaw is also so small that it needs to be seen under a magnifying glass. It can be caused by bubbles that formed during the formation of the diamond.


A Chip is a type of imperfection in a diamond, usually presented as a curved line in the middle, found on the edge, waist, etc. of a diamond by impact or drop. the imperfection of the diamond can be smaller cracks or larger fragments.


Cleavage is an imperfection in a diamond that cracks along specific directions of the crystal structure, long cracks that may extend to the surface of the diamond and affect the durability of the diamond.


The cloud is a fuzzy region made up of many small inclusions. The imperfection in a diamond makes it look like a cloud inside. The density and size of the cloud affect the clarity and brilliance of the diamond.


The imperfection in a diamond- crystal is a small mineral crystal or diamond crystal contained inside a diamond. Crystal inclusions are crystals of other minerals or the diamond itself that are encased inside the diamond during the formation of the diamond. They are a natural part of diamonds. Crystal can be distributed in any position of the diamond, some crystal is not even transparent but have color, such as white, black and so on.

imperfection in a diamond

image comes from the Internet


Feather is the tiny, curved crack inside a diamond. These cracks may appear transparent at some angles, but may appear white or iridescent at other angles. This imperfection is usually caused by a break or crack inside the crystal lattice. The size and location of the feather cracks affect the structural integrity and durability of the diamond.

Grain Center

A Grain center is an imperfection in a diamond that spread from one central point to another. Grain Center imperfections are usually caused by small changes in the orientation of crystals or the arrangement of atoms in the crystal lattice.Grain centers may cause changes in transparency in some areas of the diamond, appearing as tiny dots or lines.

Indented Natural

Indented natural refers to a natural imperfection in a diamond that is a depression close to a surface. It is part of a diamond’s original crystal and is usually not completely removed during the cutting and polishing process.

Internal Graining

Internal Graining is an imperfection in a diamond that is a line of growth that is generally discontinuous in appearance. These growth lines may be transparent or white and are usually visible under certain lighting conditions. The presence of Internal graining reflects the inhomogeneity of diamond growth.


Knot is an imperfection in a diamond that is a raised inclusion inside a diamond that extends to the surface and takes on the shape of a small dot. Knots form in diamonds because the small crystals in the original rock are not completely dissolved or removed during diamond formation, but instead are encased inside or on the surface of the diamond crystal. These inclusions are part of the diamond’s growth process and can usually be seen or felt on the diamond’s surface.

Laser Drill-hole

Laser Drill-hole is an imperfection in a diamond that is a type of artificial flaw in a diamond. It refers to a tiny hole drilled in a diamond using laser technology, often used to improve the appearance of a diamond, especially to remove black inclusions or impurities inside. This flaw can be seen under a 10x magnifying glass or microscope, and is sometimes visible to the naked eye.


Needle is an imperfection in a diamond that looks like a needle. The imperfection is usually straight or slightly curved, transparent or white, and may be present alone or in groups. This kind of imperfection appears to be due to tiny fibrous or needle-like inclusions that are encrusted inside the diamond crystal during diamond formation.


Pinpoint is an imperfection in a diamond that is a very small dot. The imperfection is often so small that it is hard to see under a magnifying glass. They have little effect on diamonds when they are alone, but may form clouds when they appear in groups. During the formation of diamonds under high temperature and pressure, tiny mineral particles or other impurities are encased inside the diamond crystal to form this small, individual pinpoint.

Twinning Wisp

Twinning wisp is an imperfection in a diamond that results from twinning formation during the growth of a diamond crystal and usually appears as fine filaments, clouds, or twisted lines that may consist of multiple lines intertwined. Such defects are common in the octahedral crystal region.

imperfection in a diamond

imperfection in a diamond(image comes from the Internet)

Imperfection in a Diamond- External Types


Abrasions are a type of imperfections in a diamond. They are small white lines or spots of scratches or wear on the edges or facets of a diamond. These flaws are usually caused by friction with other objects during processing, transportation or wearing, and usually appear on the edges or corners of the diamond’s facets.


Natural is an imperfection in a diamond that is an uneven surface that is retained during the diamond cutting and polishing process. This imperfection generally appears on the girdle or in an inconspicuous position. It has little effect on the structural integrity of the diamond, but may affect its appearance.


Nick is a kind of imperfection in a diamond that is caused by mechanical damage during the diamond cutting or polishing process. It is usually a small and sharp indentation that appears on the edge of the facet or the girdle, which will affect the appearance and clarity of the diamond.


Pit is a kind of imperfection in a diamond that is a small, round concave spot or hole. It is caused by bubbles or impurities in the diamond during the polishing process, which will affect the brilliance and clarity of the diamond.

Polish Lines

Polish lines are imperfections in a diamond that are created when the polishing wheel moves across the surface of the diamond. These imperfections are small, parallel lines that can usually only be seen under a microscope.

Burn Mark

Burn mark is a kind of imperfection in a diamond that is caused by excessive polishing temperature or friction heat. This defect is a white or brown spot or area that affects the color and luster of the diamond.


Scratch is a kind of imperfection in a diamond that is caused by friction with other objects. This defect will also affect the luster and appearance of the diamond.

Surface Graining

Surface graining is a type of imperfection in a diamond that is caused by changes in the crystal structure during the diamond growth process. This imperfection can affect the brilliance and transparency of the diamond.

Extra Facet

Extra Facet is an imperfection in a diamond that is added during the cutting process to remove blemishes or improve the shape. It is usually located on the girdle or in an inconspicuous position. This defect has little effect on the diamond’s brilliance and clarity, but may affect its symmetry rating.

Imperfection in a Diamond- Diamond Clarity Grade

Diamond clarity grades are set by GIA, which is one of the most authoritative gemological research institutions in the world. The diamond grading scales below have increasing flaws from top to bottom. And FL diamonds are completely flawless. GIA’s diamond clarity grading system includes the following categories:


FL diamond means that there has no inclusions or blemishes under 10x magnification.

IF(Internally Flawless)

IF diamond means that there has no inclusions under 10x magnification, but may have very minor surface flaws.

VVS1 & VVS2(Very, Very Slightly Included)

VVS1 diamonds mean that the inclusions are so small that they are difficult to see under 10x magnification. VVS2 diamonds still have imperfections that are difficult to see under 10x magnification, but are slightly more obvious than VVS1.

VS1 & VS2(Very Slightly Included)

VS1 diamonds have inclusions that are difficult to see under 10x magnification, but slightly more noticeable than Very Slightly Included. VS2 diamonds have slightly more noticeable blemishes than VS1 under 10x magnification, but they are still very small.

SI1 & SI2(Slightly Included)

SI1 diamonds have visible flaws under 10x magnification, but they are usually not noticeable to the naked eye. SI2 diamonds have more obvious flaws under 10x magnification, and sometimes they can be seen without a magnifier. The same SI2 diamond has more obvious flaws than SI1 diamonds.

I1, I2 & I3(Included)

I1, I2 and I3 diamonds have obvious inclusions under a 10x magnifying glass, which are visible to the naked eye and may affect the transparency and brilliance of the diamond. The degree of defects in these three grades increases in turn.

imperfection in a diamond

What diamond clarity is the best?

Imperfection makes every diamond unique. We need to learn to accept these works of art. But if we only consider the clarity, according to the 4C standard of diamonds set by GIA, FL diamond (Flawless diamond) is of course the best, and diamonds of this clarity are also very valuable.

How Can We Identify Imperfection in a Diamond?

We can distinguish some larger imperfections in a diamond with the naked eye, but if it is a subtle imperfection, you can use a professional jewelry microscope or magnifying glass to observe it. A more direct and efficient method is to check the diamond’s appraisal certificate, which usually details the diamond’s clarity grade and defect location.

Tips for Buying Diamonds with Imperfection

Diamonds with imperfections are usually cheaper than flawless diamonds. You can set a clarity priority in advance, such as diamonds with clarity grades of SI1 or SI2, which usually have imperfections that are invisible to the naked eye, but are more affordable. Then you can negotiate a suitable price based on the size of the imperfections. Or you can customize the setting method to cover part of the imperfections in a diamond to minimize them.

imperfection in a diamond

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Final Words

It is estimated that over 99% of natural diamonds contain imperfection in a diamond during their formation. If you think imperfection in a diamond affects the beauty of the diamond, then you can come to Amanda to buy lab diamonds. The advantage of this kind of lab diamond is that the production environment can be controlled by humans, so the properties and appearance of the grown diamonds are also very stable. Amanda has a variety of fine jewelry such as diamond rings, diamond necklaces, diamond earrings, diamond tennis bracelets, etc., and also supports customization, just contact here.