A diamond can appear perfectly pure across a candlelit dinner table yet carry a very different clarity grade under a gemmologist’s loupe. That distinction matters when you are choosing an engagement ring, a meaningful gift or a collector-quality stone. This guide to diamond clarity grades explains what each grade reveals, what it does not, and how to select a natural diamond that looks exceptional in the jewellery you will actually wear.
Clarity is one of the traditional four Cs of diamond quality, alongside cut, colour and carat weight. It describes the presence, size, position and visibility of internal features, known as inclusions, and surface features, known as blemishes. These characteristics are nature’s record of a diamond’s formation deep within the Earth, often billions of years ago.
A high clarity grade is rare and desirable, but it is not automatically the best choice for every buyer. The most considered decision balances visible beauty, certification, rarity, budget and the design of the finished piece.
What diamond clarity grades measure
Professional laboratories assess clarity at 10x magnification, using a carefully controlled viewing environment. The grader considers how easy it is to see each feature, where it sits within the stone, how large it is, its nature and how many features are present.
Inclusions may include tiny crystals, feathers, clouds, needles or growth marks. Blemishes can include natural marks left from the polishing process. Neither term means a diamond is poor quality. In fact, these minute characteristics can help identify an individual natural diamond, much like a fingerprint.
The clarity grade on a respected laboratory certificate provides an independent standard for comparison. When buying a significant diamond online, this documentation is especially valuable. It allows you to understand the stone beyond a product image and make a decision with greater confidence.
Guide to diamond clarity grades: the scale explained
Diamond clarity is commonly described using a scale that moves from Flawless to Included. The difference between adjacent grades can be subtle, particularly to the unaided eye.
Flawless and Internally Flawless
FL, or Flawless, diamonds have no inclusions or blemishes visible to a skilled grader at 10x magnification. IF, or Internally Flawless, diamonds have no visible inclusions at 10x, although minute surface blemishes may be present.
These diamonds are exceptionally rare, particularly in meaningful carat sizes. Their scarcity brings strong collector appeal and a premium price. For a buyer seeking the rarest expression of natural brilliance, FL and IF diamonds hold obvious allure. Yet in a ring worn day to day, their visual advantage over a carefully selected VVS or VS diamond may be impossible to see without magnification.
Very, Very Slightly Included
VVS1 and VVS2 diamonds contain minute inclusions that are very difficult for a skilled grader to locate at 10x magnification. VVS1 generally has fewer, smaller or more favourably positioned features than VVS2.
VVS diamonds offer a beautiful meeting point of rarity and visual purity. They are an excellent choice for those who value a high-specification natural diamond, perhaps for a solitaire engagement ring where the centre stone will be closely admired. They can also be compelling for collectors who appreciate exceptional crystal transparency without stepping into Flawless pricing.
Very Slightly Included
VS1 and VS2 diamonds have minor inclusions visible under 10x magnification, but they are typically difficult to see without a loupe. In many well-chosen stones, especially below certain carat weights, VS clarity offers an eye-clean appearance with more flexibility in the budget.
For many discerning buyers, VS is the sweet spot. The diamond can present as crisp, bright and clean in normal viewing while leaving more room to prioritise an excellent cut, a preferred colour grade or additional carat weight. The exact stone still matters: a VS2 inclusion near the edge may be less noticeable than one sitting beneath the table, the large flat facet at the diamond’s centre.
Slightly Included
SI1 and SI2 diamonds have noticeable inclusions at 10x magnification. SI1 diamonds are frequently eye-clean, particularly when the inclusions are small, light in colour or positioned near the girdle where a setting can disguise them. SI2 diamonds require closer assessment, as inclusions may sometimes be visible without magnification.
There is no universal rule that all SI diamonds should be avoided. An SI1 diamond with a fine feather at the edge may look far cleaner than its grade suggests, while an SI2 diamond with a dark crystal beneath the table may be distracting. High-resolution imagery, video and an independent certificate are particularly helpful at this level.
Included
I1, I2 and I3 diamonds have inclusions that are obvious under 10x magnification and may be visible to the naked eye. In some cases, these features can affect transparency, sparkle or durability.
An I-grade diamond may suit a buyer who places carat size above clarity and understands the visual compromise. However, for a piece intended to become a long-term heirloom, it is wise to inspect the nature and location of inclusions carefully. A prominent feather near a vulnerable edge, for example, deserves professional advice before setting.
Why position matters as much as the grade
A clarity grade is a useful shorthand, not the full story of a diamond. Two stones with the same grade can look quite different because the grade does not simply count inclusions.
An inclusion beneath the table is often easier to notice than one near the outer edge. Inclusions at the edge can sometimes be concealed by a claw or bezel setting, although they should not create a durability concern. White or transparent inclusions tend to be less apparent than dark crystals, while a small feature in a lively, beautifully cut diamond may disappear in its scintillation.
The style of jewellery matters too. A solitaire ring puts the centre stone on display, making eye-clean clarity more desirable. In a halo or three-stone design, the surrounding diamonds and overall sparkle can make modest inclusions less apparent. Emerald-cut diamonds, with their long open facets and elegant mirror-like flashes, often reveal inclusions more readily than brilliant-cut diamonds. They may reward a step up in clarity.
Choosing clarity alongside cut, colour and carat
A diamond’s cut has the greatest influence on its fire, brightness and scintillation. A superbly cut VS2 diamond can often look more captivating than a poorly cut VVS diamond because light performance is what gives a diamond its living sparkle.
Colour and carat weight also change the clarity decision. As diamonds become larger, inclusions are generally easier to see, so buyers may prefer VS or VVS clarity in a larger centre stone. In smaller diamonds, a well-selected SI1 can deliver impressive visual value. For higher colour grades, especially in a clean platinum or white gold setting, any dark inclusion can stand out more clearly, making careful stone selection worthwhile.
Rather than pursuing the highest grade by default, consider the priority for your piece. A rare, investment-grade natural diamond may justify VVS or higher clarity. For an engagement ring designed around brilliance and daily wear, an eye-clean VS or selected SI1 diamond can be a thoughtful and elegant choice.
Reading a diamond certificate with confidence
A laboratory certificate should identify the diamond’s clarity grade and often includes a plotted diagram showing the location of significant internal and external features. The comments section may also note details that do not fit neatly on the plot.
Look beyond the headline grade. Ask whether the stone is eye-clean, what type of inclusions are present, and whether any feature could affect durability. Request clear magnified imagery and video where available, but remember that highly magnified images can make a tiny inclusion appear far more dramatic than it is in person.
For natural diamonds, transparent disclosure around origin, certification and any treatments supports a more meaningful purchase. A respected certificate does not replace expert selection, but it gives you an enduring record of the stone’s defining qualities and helps protect confidence in its value.
A refined clarity choice for a lifetime piece
The right diamond clarity grade is the one that honours both the stone and the person who will wear it. Some buyers are drawn to the quiet rarity of a VVS natural diamond; others find greater meaning in choosing a beautifully cut, eye-clean VS stone that allows for a larger carat weight or a bespoke setting.
Take time to view the diamond as a whole, not as a line of letters on a certificate. When its natural brilliance, ethical provenance and craftsmanship come together, the result is more than a beautiful purchase. It is a gem with a story worthy of being carried forward.
