Understanding Diamond Clarity: What does "eye-clean" mean and which inclusions are actually visible?

Anyone selecting a diamond will quickly encounter terms like VVS, VS, or SI. These abbreviations describe the clarity of a diamond. However, when purchasing, many people have a much more practical question: Can I actually see the inclusions with the naked eye?

This is exactly where the term "eye-clean" often comes up. Simply put, it describes a diamond whose inclusions are not visible under normal observation with the naked eye.

Important to know: "Eye-clean" is not an official clarity grade from a gemological laboratory, but rather a term used in the diamond trade. Therefore, a certificate and the actual visual inspection fulfill different purposes.

In this guide, we explain how diamond clarity is assessed, why two stones of the same clarity grade can look different, and which inclusions are actually relevant when buying jewelry.

If you would like to first understand Carat, Color, Clarity, and Cut together, also read our Guide to the 4Cs of Diamonds.

What does clarity mean for a diamond?

Diamond clarity describes the internal and external characteristics of a diamond.

Internal characteristics are referred to as inclusions. Characteristics on the surface are often described as blemishes.

Such features can vary greatly in terms of size, type, number, position, and visibility. Therefore, it is not enough to simply ask whether a diamond has inclusions.

The crucial question is rather: Which features are present, where are they located, and how much do they influence the overall visual impression?

What does "eye-clean" mean?

In the diamond trade, "eye-clean" is typically used to describe a stone in which inclusions are not recognizable under normal observation with the naked eye.

The term is practical but not fully standardized. This means that viewing distance, lighting, eyesight, the size of the diamond, and even the position of an inclusion can influence whether someone perceives a feature.

A diamond perceived as eye-clean therefore does not necessarily have to be free of inclusions.

It may well show features under a loupe or microscope and still appear perfectly clear in a piece of jewelry being worn.

Eye-clean is not an official clarity grade

This is particularly important for purchasing.

Terms like FL, IF, VVS, VS, or SI belong to gemological clarity classifications. "Eye-clean," on the other hand, is not an additional official grade on this scale.

A serious comparison should therefore not be "eye-clean or certified," but rather:

• What clarity grade does the grading report show?
• Which features are present?
• Where are they located?
• And how does the diamond actually look without magnification?

The classic GIA clarity scale for natural diamonds

For natural diamonds, the GIA uses a scale with a total of eleven clarity grades.

FL – Flawless

Under prescribed examination conditions, no inclusions or blemishes are visible at 10x magnification.

IF – Internally Flawless

No internal inclusions are visible; certain surface blemishes may be present.

VVS1 and VVS2 – Very Very Slightly Included

Very small inclusions that can be difficult for a trained grader to see at 10x magnification.

VS1 and VS2 – Very Slightly Included

Small inclusions that are recognizable at 10x magnification, but are often not noticeable to the naked eye in many stones.

SI1 and SI2 – Slightly Included

Inclusions are more clearly recognizable at 10x magnification. Whether they are also visible to the naked eye depends on the specific stone and the properties of the inclusions.

I1, I2, and I3 – Included

The inclusions are clearly pronounced under magnification and, depending on the grade, may also be visible without magnification and influence transparency or brilliance.

Why the clarity grade alone doesn't tell the whole story

Two diamonds with the same clarity grade do not have to look visually identical.

The reason is that several factors are evaluated together.

1. Size of the inclusion

A larger feature fundamentally has a different visual impact than a tiny dot.

2. Position

A feature directly under the table can be more noticeable than a comparable feature closer to the outer edge.

3. Number

Several small features may be evaluated differently than a single feature.

4. Type of feature

Crystals, feathers, clouds, or other clarity characteristics have different structures and appearances.

5. Contrast

A darker feature may appear more noticeable than a very transparent feature of the same size.

What types of inclusions exist?

Diamonds can have a variety of different clarity characteristics. Some of the most frequently mentioned terms are:

Crystal

A small mineral crystal can be trapped inside a diamond during its formation or growth. Its visibility depends, among other things, on size, color, and position.

Feather

A so-called "feather" is an internal feature that can appear feather-like under magnification. Its extent and position can vary greatly.

Pinpoint

Very small, dot-like features can occur individually or in groups.

Cloud

A group of very small features can appear as a cloud-like area under certain conditions. Whether it influences transparency depends on its density.

Is a dark inclusion automatically bad?

Not every visible characteristic should be judged solely by its color.

Position, size, and contrast must be viewed together. A very small dark crystal on the edge may be visually less relevant than a larger transparent feature directly under the table.

This is precisely why a professional clarity assessment is not based on a single feature.

Why the position of an inclusion is so important

The table is the large upper facet of a diamond. A feature that lies centrally under this surface can be easier to spot when looking at the stone.

Conversely, a feature of the same size closer to the outer area can appear significantly less noticeable and, depending on the ring setting, can sometimes be less present.

This does not mean that features near the edge are inherently unimportant. With certain features, it must also be considered whether they could influence structural durability.

Can an SI diamond be eye-clean?

Yes, that is possible.

In particular, within the SI categories, there are significant differences between individual stones. An SI diamond can have features that are clearly recognizable at 10x magnification but are barely or not at all noticeable during normal observation.

On the other hand, another stone of the same nominal clarity grade may have a feature that is centrally located or shows greater contrast and is therefore more easily perceived.

This is precisely why one should not buy exclusively based on the abbreviation in the certificate in these ranges.

Do I absolutely need VVS or IF?

That depends on your personal priorities.

Very high clarity grades are rarer and can be priced accordingly higher. However, the difference to a lower, but visually very clean clarity is not necessarily visible to the naked eye.

Those who primarily focus on the visual impact of a piece of jewelry can therefore set different priorities than someone for whom a particularly high gemological clarity grade is important in itself.

Clarity and diamond size

As the size of a diamond increases, clarity characteristics can also become easier to perceive because the visible stone has more surface area.

The same clarity category can therefore have a different visual effect at different carat sizes.

Cut shape and facet pattern also influence perception.

Clarity and cut shape

Not every diamond shape hides clarity characteristics in the same way.

Brilliant cuts have numerous facets and strong light reflections, which can make smaller features appear less visually noticeable.

Step-cut shapes like the Emerald Cut, on the other hand, have larger, calmer facet surfaces. This can draw the eye deeper into the interior of the diamond.

A sensible choice of clarity should therefore also match the desired diamond shape.

Special feature of lab-grown diamonds

For lab-grown diamonds, you should also pay close attention to the respective grading report. The report format and the terminology used can depend on the lab and the time of issuance.

An important current example is GIA: For colorless to near-colorless lab-grown diamonds, GIA has been using a new grading system since October 2025 with the overarching categories Premium and Standard, instead of continuing to use the classic color and clarity terminology developed for natural diamonds as the final grade.

Therefore, especially with lab-grown diamonds, the following applies: Read the actual grading report provided and do not rely solely on general charts from the internet.

Where can I find clarity information in the certificate?

Depending on the lab, a gemological grading report can contain information on clarity, color, weight, cut, and other properties.

For certain types of reports, a so-called "clarity plot" may also be present, in which the location of important clarity features is documented schematically.

You can learn more about gemological grading reports in our guide on GIA, HRD, and IGI diamond certificates.

You can also find further information on certification on our page Sirius Diamond Certificates, Authenticity Guarantee & Expertise.

Which clarity is suitable for a solitaire ring?

With a solitaire ring, the eye focuses very strongly on a single diamond. Therefore, it is worth considering both the certificate details and the actual visual impact of the center stone.

An unnecessarily high clarity grade is not automatically the best decision for every buyer. The decisive factor is the desired relationship between visual impact, size, color, cut, and personal budget.

You can find various designs in our diamond solitaire ring collection.

And for an engagement ring?

An engagement ring is often worn regularly for many years. In addition to clarity, cut, setting, stone shape, and suitability for everyday wear also play an important role.

Anyone selecting a single center stone should not be guided by a single abbreviation, but should consider the diamond as a whole.

Discover different stone shapes and designs in our engagement rings collection.

Our checklist for diamond clarity

• Do not look at the clarity grade in isolation.
• Check the size and position of the inclusions.
• Pay attention to whether features are located centrally or near the edge.
• Distinguish between a magnified image and normal observation.
• Take into account diamond size and cut shape.
• Read the respective gemological grading report.
• Note that "eye-clean" is not an official laboratory grade.
• Always compare clarity together with Cut, Color, and Carat.

Conclusion: Not every inclusion is relevant to the naked eye

Diamond clarity is much more nuanced than the question of whether a stone has inclusions or not.

Size, type, number, position, and contrast of the clarity features together determine how a diamond is rated and whether a feature can even be perceived during normal wear.

The term "eye-clean" can therefore be helpful for practical comparison, but should never replace a gemological certificate.

The most sensible purchasing decision is made when you consider clarity, cut, color, carat weight, proportions, and the actual visual impact together.

Discover different diamonds and designs in our ring collection from Sirius Diamond and choose not just by a number on paper, but by the overall appearance of the piece of jewelry.