Yes, and rarity scales sharply with clarity. Natural diamonds form over one to three billion years under extreme heat and pressure, and almost all of them bears some record of that journey. Fewer than 1% reach Flawless or Internally Flawless clarity grade, according to the GIA. The higher the clarity grade, the rarer the gem, and the more that scarcity shapes both its value and what it means to own one.
How natural and lab-grown diamonds compare on clarity and rarity
| Factor | Natural diamond | Lab-grown diamond |
| How they form | Formed 90 to 125 miles below the Earth’s surface over one to three billion years. | Grown in a factory in a matter of weeks using HPHT or CVD methods. |
| Flawless clarity | Fewer than 1% of natural diamonds reach Flawless or Internally Flawless grade, according to the GIA. | Flawless grades are achievable on demand; high clarity is the norm rather than the exception. |
| Inclusions | Formed naturally by minerals, heat and pressure during growth; a geological fingerprint unique to each gem. | Typically fewer inclusions; those present tend to be metallic or synthetic in nature. |
| Larger gems | The bigger the natural diamond, the rarer it is; a gem above 2 carats with high clarity is very scarce. | Produced to specification. Larger stones do not carry the same scarcity premium. |
| Provenance | Every natural diamond has a traceable geological origin, from country and region to formation conditions. | No geological provenance. |
What defines a high-clarity diamond?
Clarity measures the presence of inclusions and surface blemishes in a natural diamond. It’s one of the 4Cs of diamonds, alongside cut, color and carat, and it measures how free a gem is from internal and external characteristics. These are known as inclusions (internal) and blemishes (surface). Most natural diamonds have some. They’re the fingerprints left by extreme heat, immense pressure and billions of years of formation deep within the Earth. High-clarity natural diamonds are those where that evidence is minimal or invisible, even under magnification.
Levels of diamond clarity: tools and the grading scale
The diamond grading process for clarity is precise, exacting work. Gemologists use 10x loupes, high-powered microscopes and advanced imaging technology to assess every facet and internal plane1. When comparing Flawless vs Internally Flawless diamonds, imperfections are so microscopic that even a slight error in grading can shift a diamond into a different category, changing its market value significantly2.
That’s why a standardized diamond clarity scale matters. The GIA’s system exists to ensure consistency across every laboratory, giving buyers, collectors and investors a universal language. Without it, comparing two natural diamonds would be guesswork. With it, a Flawless designation means the same thing whether the gem is assessed in New York, Antwerp or Mumbai.
The diamond clarity scale explained
So, what’s the highest diamond clarity? The GIA’s diamond clarity grading system classifies natural diamonds across 11 grades3:
- FL (Flawless): No inclusions or blemishes visible under 10x magnification.
- IF (Internally Flawless): An internally flawless diamond has No internal inclusions; only minor surface blemishes that don’t affect the gem’s structure.
- VVS1 and VVS2 (Very, Very Slightly Included): Inclusions so minute they’re difficult even for experts to locate.
- VS1 and VS2 (Very Slightly Included): Minor inclusions visible under magnification but not to the naked eye.
- SI1 and SI2 (Slightly Included): Inclusions noticeable under magnification, sometimes visible to the naked eye.
- I1, I2 and I3 (Included): Inclusions visible to the naked eye that may affect brilliance and transparency.
How is clarity affected by shape and carat?
The clarity and carat relationship is more connected than most buyers realize, and shape plays into it too. Larger natural diamonds, particularly those above 2 carats, have more surface area for inclusions to become visible. That’s why diamond clarity grades tend to matter more at higher diamond carat weights4.
Shape plays a direct role too. Step-cut shapes (emerald and Asscher in particular) feature large, open tables that make inclusions more visible. Brilliant cut shapes (round, oval, cushion, pear) are more forgiving: the faceting pattern breaks up light in a way that can mask minor inclusions5. A VS1 in a round brilliant will often look as clean as an FL to the naked eye. In an emerald cut, the difference between those two grades is considerably more apparent.
What is an eye-clean diamond?
An “eye-clean diamond” is one where no inclusions or blemishes are visible to the naked eye from a normal viewing distance, typically around 10 to 12 inches6. It’s a practical concept rather than an official GIA designation, but it’s one of the most useful benchmarks for buyers.
Most VS1 and VS2 natural diamonds are considered eye-clean. Many SI1 grades are too, depending on the placement and nature of the inclusion. FL and IF, by definition, are always eye-clean, but the difference between an IF and a VS1 to the naked eye is often imperceptible. Understanding this distinction is one of the most useful tools in diamond clarity decision-making.
Some buyers are drawn to a diamond with slight inclusions, ones that speak to a gem’s one-of-a-kind formation and geological story. Others prefer total visual purity. Neither position is wrong. The question is what matters to you.
What are the types of diamond inclusions?
Every natural diamond carries its own internal landscape. These characteristics are categorized as either inclusions or blemishes, and the type, size and placement of each one influences both the clarity grade and the gem’s visual presentation.
Most common inclusion types
- Needle: Thin, elongated crystal inclusions, usually colorless and difficult to see.
- Cloud: Groups of tiny pinpoints clustered together. Dense clouds can create a milky or hazy appearance.
- Crystal: Mineral crystals trapped within the diamond during formation, sometimes appearing as tiny colored dots.
- Feather: Internal fractures that resemble fine cracks. Larger feathers near the surface can affect structural integrity.
- Pinpoint: Tiny dot-like inclusions. Individually harmless; in clusters they form clouds7.
How diamond inclusions affect sparkle
Not all inclusions interrupt a diamond’s brilliance equally. Placement matters most: an inclusion at the center of the table (the flat top facet) sits directly in the path of light, while one near the girdle (the outer edge) often has minimal impact on the gem’s visual performance.
Size and transparency also factor in. A large, dark crystal inclusion absorbs light; a tiny, colorless pinpoint at the edge of the gem is unlikely to affect sparkle at all. The best way to understand how inclusions affect a specific natural diamond is to view the GIA clarity chart alongside the gem itself. The position, not just the grade, tells the full story.
Why high-clarity natural diamonds are so rare
To understand what makes a Flawless or Internally Flawless gem so exceptional, it helps to understand natural diamond formation. Diamonds grow deep underground, under pressure that would crush steel, at temperatures exceeding 2,000 degrees Fahrenheit, over hundreds of millions of years. Almost every one of them bears some record of that journey: a trapped mineral, a microscopic fracture, a shift in crystal structure. These are the inclusions that make each gem one of a kind.
A diamond that arrives without any of that evidence (one that registers as Flawless or Internally Flawless under the GIA’s grading) is an exception on a scale that’s difficult to visualize. The diamond clarity ranking narrows sharply at the top of the scale and the gems that reach it are genuinely, measurably scarce.
How to select the right clarity grade
Start with shape, because shape determines everything else. Emerald and Asscher cuts have large, open tables that read like windows into the gem. Inclusions that would be invisible in a round brilliant are plainly visible here. For step cuts, VS1 is the practical minimum. For brilliant cuts, the faceting does the work of concealing minor inclusions, which means a well-chosen VS2 or SI1 can look indistinguishable from a Flawless gem in the hand.
Then consider carat weight. The clarity and carat relationship sharpens above 2 carats: what’s negligible in a smaller stone becomes noticeable at scale. A VS2 that looks immaculate at 1 carat may tell a different story at 3. Understanding diamond carat in relation to clarity is one of the most useful things you can do before committing to a grade.
The question most buyers don’t ask soon enough is whether the money spent moving up a clarity grade would be better spent on cut. It usually would. Cut is what produces brilliance (the scintillation and fire that make a diamond extraordinary to look at). A VS2 with an excellent cut will outperform a Flawless gem with a mediocre one every time. Knowing what is diamond cutting is essential context before you make that call.
Finally, diamond clarity doesn’t sit in isolation. How diamond color interacts with clarity can shift what grade makes visual sense for your specific gem.
If you’re still unsure, these are the grades that tend to work hardest for each situation:
- For a brilliant-cut everyday ring: VS2, it’s eye-clean and excellent value
- For an emerald or Asscher cut: VS1, the open table demands good clarity grades.
- For a gem above 2 carats: VS1 or higher. Size amplifies everything, including inclusions.
- For a proposal ring: VS1 or VS2. These are clean enough to impress but leave room for the cut and carat that matter more.
- For an heirloom or investment piece: IF or VVS1. These grades that hold their meaning across generations.
FAQs
Why are natural diamonds rare?
Natural diamonds form 90 to125 miles below the Earth’s surface, under pressure that would crush steel and temperatures exceeding 2,000 degrees Fahrenheit, over hundreds of millions of years. They reach the surface only through rare volcanic events, and gem-quality stones represent a fraction of what is recovered. Understanding natural diamond formation is the clearest way to understand why genuine scarcity is built into every gem.
Are larger natural diamonds disproportionately rare?
Yes. Larger natural diamonds have more surface area for inclusions to become visible and the probability of a gem forming without significant inclusions decreases as size increases8. A high-clarity natural diamond above 2 carats is genuinely exceptional. It’s the kind of gem that commands significant premiums at auction. The clarity and carat relationship sharpens considerably at that scale.
How can diamond clarity influence the overall presentation during a proposal?
A well-cut natural diamond will scintillate in almost any light, candlelight included, because brilliance is primarily a function of cut, not clarity. But clarity determines what you’re looking at when the light catches it. An eye-clean gem, VS2 or above, means no inclusion will pull focus in that moment. If you’re thinking about proposal planning, VS1 and VS2 grades give you the best balance of visual purity and value for a ring that will be seen for the first time under scrutiny.
Why do some natural diamonds have famous historical significance?
The diamonds that ended up in royal collections or at the center of famous heists tend to share one characteristic beyond size: exceptional clarity. The Archduke Joseph, the Koh-i-Noor, the Cullinan, the Regent … all colorless, Flawless or near-Flawless gems that read differently to the eye than one with visible inclusions. That visual authority, combined with provenance, is what made these gems culturally significant enough to be part of diamond history.
Why are natural diamonds considered the ultimate heirloom?
A natural diamond doesn’t change. The inclusions that make it identifiable are permanent; the brilliance of a well-cut gem doesn’t diminish with time. Pass a VS1 down through three generations and it arrives looking exactly as it did the day it was bought. High-clarity grades add another layer of diamond value to that permanence: the knowledge that what you’re passing on is something that couldn’t easily be found again.
Sources
- www.gia.edu/gia-news-research/guardians-trust-gias-innovative-research-instruments-services/ ↩︎
- www.vrai.com/flawless-diamonds/ ↩︎
- www.4cs.gia.edu/diamond-clarity/ ↩︎
- www.gia.edu/diamond-quality-factor/ ↩︎
- www.4cs.gia.edu/guide-diamond-shapes-engagement-rings/ ↩︎
- www.diamondrensu.com/education/what-are-eye-clean-diamonds/ ↩︎
- www.naturalgemstones.com/education/types-of-inclusions/ ↩︎
- www.capetowndiamondmuseum.org/education/natural-inclusions-in-diamonds/ ↩︎
