Diamond Clarity: What You See and What You Pay For
A diamond can look perfectly luminous from across the room while carrying tiny marks formed deep within the earth billions of years ago. Diamond clarity is the measure used to describe those internal features and surface characteristics, but it should never be viewed in isolation. The most beautiful diamond is one whose sparkle, proportions and setting come together to suit the person who wears it.
For an engagement ring, a diamond pendant or an enduring pair of studs, clarity helps you understand rarity and make a considered choice. It is not, however, a simple contest for the highest grade. At Harper Kendall, we believe fine jewellery should feel individual - crafted with discernment, worn with confidence and chosen for the way it makes you feel.
What Is Diamond Clarity?
Diamond clarity describes the presence, size, position and visibility of features within a diamond, known as inclusions, as well as features on its surface, called blemishes. These are assessed under 10x magnification by trained graders.
Inclusions may include minute crystals, feathers, clouds or growth lines. Blemishes can include tiny scratches or naturals, which are small areas of the original rough diamond surface left at the girdle. Their names can sound more dramatic than their appearance. In many stones, these characteristics are so small that they cannot be seen without magnification.
Clarity is part of the established four Cs - cut, colour, clarity and carat weight. Each contributes to a diamond’s character, yet cut often has the greatest influence on the light performance seen by the eye. A well-cut diamond can appear exceptionally bright and lively, while a diamond with a very high clarity grade but less accomplished proportions may not deliver the same visual impact.
The Diamond Clarity Scale, Explained
The standard clarity scale runs from Flawless to Included. It is a precise language for comparing diamonds, not a rulebook for what will look beautiful in jewellery.
Flawless and Internally Flawless
Flawless diamonds have no inclusions or blemishes visible to a skilled grader at 10x magnification. Internally Flawless diamonds have no internal inclusions visible at this magnification, though they may have minute surface blemishes. Both are exceptionally rare, valued for their scarcity as much as their appearance.
VVS and VS Clarity
Very, Very Slightly Included diamonds, known as VVS1 and VVS2, contain minute inclusions that are extremely difficult for a grader to locate under 10x magnification. Very Slightly Included diamonds, VS1 and VS2, have minor inclusions that remain difficult to see under magnification.
These grades offer impressive purity and are particularly appealing when a wearer values technical rarity, or when a design presents the diamond close to the eye. They are also a natural consideration for larger centre stones, where any inclusion has more surface area in which to show.
SI and Included Clarity
Slightly Included diamonds, SI1 and SI2, contain inclusions that are noticeable under 10x magnification and may, depending on the individual stone, be visible without it. Many SI1 diamonds are beautifully eye-clean, meaning their inclusions cannot be readily seen in normal viewing conditions.
Included grades, I1, I2 and I3, have inclusions that are obvious under magnification and can often be visible to the naked eye. Inclusions at this level may also affect transparency or durability, especially if a feather reaches the surface in a vulnerable position. This does not make every included diamond unsuitable, but it calls for careful expert assessment rather than a decision based on a grade alone.
Why the Grade Is Only Part of the Story
Two diamonds with the same clarity grade can look quite different. A single small inclusion placed beneath a dark facet near the edge of a diamond may be less apparent than a pale cloud positioned directly under the table, the large central facet seen face-up. Placement matters, as does the inclusion type, contrast and the diamond’s shape.
A round brilliant cut is especially forgiving because its facet pattern disperses light so effectively. An SI1 round diamond may look pristine when worn. Step-cut shapes such as emerald and Asscher cuts have broad, open facets and a quieter light pattern, which can make inclusions easier to notice. For these elegant geometric silhouettes, many buyers choose a higher clarity range or select a stone with inclusions positioned discreetly towards the edges.
Carat weight matters too. As a diamond becomes larger, its inclusions may become easier to see. That said, the right SI or VS diamond can still offer a clean, refined appearance at a substantial size. The individual stone remains more meaningful than the letters on a report.
Choosing a Clarity Grade for Your Jewellery
Start with the piece, not the grading chart. A solitaire engagement ring places the diamond at the centre of attention, so eye-clean clarity and a strong cut are sensible priorities. A halo setting, pavé shoulders or a three-stone design can create plentiful light and visual detail around the centre stone, allowing you to consider a wider range of clarity grades without compromising the overall impression.
For diamond earrings, viewers tend to see light, movement and overall brilliance before they see minute internal features. Matching the pair in colour, size and visual character is often more important than pursuing an unusually high clarity grade. In a pendant, the diamond is generally viewed from a greater distance, making an eye-clean stone with excellent sparkle a compelling choice.
For a bespoke design, the setting can be used thoughtfully. A claw or bezel may conceal a small edge inclusion, while a delicate design should avoid placing pressure on a stone with a significant feather near the girdle. This is where considered design guidance makes a material difference: the stone and setting should support one another beautifully.
Natural Features, Lab-Grown Diamonds and Transparency
Natural and lab-grown diamonds can both have inclusions. The grading approach is broadly the same: clarity is judged according to what is visible at 10x magnification, regardless of origin. Lab-grown diamonds may show different growth features from natural diamonds, but neither should be assumed to be clearer solely because of how it was formed.
Always consider a diamond alongside its grading documentation, where available. A report records the clarity grade and may include a plotted diagram showing significant clarity characteristics. It is useful context, but it cannot replace seeing how the diamond handles light. Ask to understand whether the stone is eye-clean, where its inclusions sit and whether there are any features with durability implications.
Treat terms such as “perfect” with care. A flawless grade refers to a technical assessment under controlled magnification; it does not automatically mean a diamond will look more brilliant than every lower-clarity alternative. Beauty lives in the balance of precision cutting, luminous colour, considered proportions and the confidence of the person wearing it.
A More Considered Way to Choose
The most satisfying choice is often a diamond whose clarity is high enough to look clean and radiant in its intended setting, while leaving room to prioritise the elements that matter most to you. That may be a larger carat weight, an exceptional cut, a particular shape or a bespoke detail that makes the piece unmistakably yours.
Rather than choosing by grade alone, view diamonds in natural light as well as jewellers’ lighting. Look at them face-up, from the side and at normal wearing distance. Notice whether your eye is drawn to an inclusion or simply to the play of light across the stone. If the latter is true, you may have found a diamond with precisely the right clarity for your design.
A diamond is not admired through a loupe at every moment of its life. It is admired across a dinner table, caught in sunlight on the way to work, and recognised as part of a personal story. Choose the stone that brings that story into focus.
