How to Read a Diamond Clarity Grade Like a Gemologist
Pick up any GIA or IGI grading report and you’ll find a small diagram that looks like a circle with scattered symbols inside it — dots, lines, tiny clouds. Most buyers glance at it and move on to the price. Gemologists spend considerably longer with that diagram, because it tells a story the grade letter alone cannot.
Understanding that story makes you a far better buyer.
What Clarity Actually Measures
Diamond clarity is a measure of how many internal characteristics (inclusions) and surface irregularities (blemishes) exist within a stone, and how much those characteristics affect its appearance under 10x magnification. The grading scale used by GIA — and largely adopted by IGI — runs from Flawless (FL) down through several Internally Flawless (IF), Very Very Slightly Included (VVS1, VVS2), Very Slightly Included (VS1, VS2), Slightly Included (SI1, SI2), and Included (I1, I2, I3) grades.
The grade is not just a count of inclusions. It weighs five factors: the size of each inclusion, its nature (what type of inclusion it is), its number, its location within the stone, and its relief — meaning how visible it is against the diamond’s background. Two diamonds with the same number of inclusions can carry different grades if one has a large crystal near the table and the other has a feathery cloud tucked near the girdle.
A common misconception is that any SI1 is a clean-looking diamond, or that all VVS2 diamonds look identical. Neither is true. SI1 from one laboratory, one grader, one stone can look noticeably different from another SI1. The grade is a starting point, not a complete answer.
Reading the Clarity Plot Step by Step
The clarity plot on a grading report shows two views: a face-up diagram (looking down through the table) and a side profile. Each inclusion is marked with a specific symbol and color. Red symbols indicate internal inclusions; green symbols mark surface blemishes.
The Inclusion Types You’ll Encounter
Crystals are mineral particles trapped inside the diamond during formation. They appear on the plot as small filled dots or squares. A single large crystal near the center of the table is a much bigger concern than several tiny ones scattered near the pavilion. If the crystal appears dark under magnification, it can affect the stone’s face-up appearance significantly.
Feathers are small fractures within the stone. On the plot, they’re shown as irregular lines, sometimes angular, sometimes branching. Feathers near the girdle are worth attention because physical impact in that region — a knock against a countertop, for instance — can extend an existing feather. This is one reason clarity grade intersects meaningfully with durability, a point covered in depth in Lab Grown Diamond Durability: The Complete 2026 Guide.
Clouds are clusters of tiny pinpoint inclusions grouped so closely that they form a hazy region. The plot typically marks them with a dotted circle. The tricky thing about clouds is that a single cloud with only a few pinpoints may have negligible visual impact, while a dense cloud — sometimes described as “heavy cloud” in the comments section — can cause a milky or hazy appearance visible to the naked eye, even in a VS grade stone. Always read the comments section on the report. If it mentions “cloud not shown” or “clouds are present throughout,” take that seriously.
Needles are elongated crystals that look like tiny slivers. They appear as thin lines on the plot, distinct from feathers because they run in a straight direction rather than branching. Needles are generally less concerning than feathers unless grouped or large.
Indented naturals are remnants of the original diamond rough that extend slightly below the polished surface. They’re typically found near the girdle and are treated as internal characteristics in grading.
Location Changes Everything
The same VS2 crystal near the culet — the small pointed base of a round brilliant — looks entirely different from a VS2 crystal positioned directly under the table facet. The table facet is the large flat top of the diamond, and it acts like a window. Anything centered beneath it is more visible both to the eye and to the grader.
Inclusions near the girdle, on the other hand, are partially hidden by prong settings in most ring styles. A skilled buyer, or a jeweler helping you select a stone, will account for setting style when evaluating whether an inclusion’s location matters in practice.
There’s also the question of symmetry and brilliance masking. A well-cut round brilliant with strong light return can visually mask inclusions that would be obvious in a poorly cut stone of the same grade. This is why cut quality influences clarity perception more than most buyers expect.
How Lab Grown Diamond Clarity Differs
Lab grown diamonds are graded to the same clarity scale as mined diamonds — GIA and IGI apply identical criteria. But the nature of inclusions found in lab grown stones tends to differ from those in mined diamonds, reflecting the different conditions of their growth.
CVD-grown diamonds, for example, sometimes develop graining or strain patterns that appear as hazy lines under polarized light, though these are rarely clarity-grade-affecting in well-grown stones. They may also contain metallic or graphitic inclusions in lower-quality material. HPHT-grown diamonds can contain flux inclusions — tiny metallic particles from the growth medium — which show up as distinct reflective spots on the clarity plot.
But here’s what matters practically: because lab grown diamond production allows for controlled environment and precise monitoring, it’s considerably easier to produce high-clarity stones consistently. Inclusions in mined diamonds result from millions of years of uncontrolled geological processes — temperature fluctuations, chemical intrusions, pressure variations. A growth chamber has none of that randomness. At Elevé Diamonds, where the collection draws on over a century of gemological knowledge from Tibarumal’s expertise, the stones consistently achieve VVS and VS clarity grades, precisely because the controlled growth process minimizes the formation of significant inclusions from the start.
This isn’t a minor distinction. In the mined diamond market, achieving IF or VVS1 clarity requires selecting from a small fraction of production. In lab grown production, those grades represent a much higher proportion of output, which is one reason lab grown diamonds deliver better clarity at equivalent or lower price points. For a fuller picture of how these stones compare on quality dimensions, Lab Grown Diamond Quality Standards and Certification 2026 covers the certification landscape in detail.
The Comments Section Is Not Optional Reading
Both GIA and IGI reports include a comments field, and most buyers skip it entirely. This is one of the more consistent mistakes worth flagging. The comments section discloses characteristics that the plot may not capture fully — things like “additional clouds not shown,” “surface graining not shown,” “laser drill hole present,” or “faint strain” in the case of lab grown stones.
“Additional clouds not shown” is particularly important. It means the grader found more inclusions than they could practically map on the diagram. A diamond with this note in the comments may look noticeably hazier than its grade suggests, particularly in lower VS or SI grades.
“Laser drill hole present” indicates a treatment — a channel drilled to remove a dark inclusion. This is rare in lab grown diamonds (because the economics of treatment make less sense when a cleaner stone can simply be grown) but common enough in mined diamonds that it appears on reports with some regularity.
Comparing Grades Across Laboratories
A GIA VS2 and an IGI VS2 are not necessarily equivalent. GIA is regarded as the most conservative grader in the industry — their standards for each grade tier are strict, and a stone that GIA grades VS2 might earn a VS1 or even a VVS2 from a more lenient laboratory. IGI has tightened its standards for lab grown diamonds over recent years and is now the dominant certification body for lab grown stones globally, though some variance still exists.
When comparing two diamonds across different certification bodies, account for this. An IGI VS1 lab grown diamond at a given price point is typically an excellent value. Understanding whether the grading is consistent is part of reading the report intelligently. You can explore how to assess authenticity and certification together in How to Verify Lab Grown Diamond Authenticity: Expert Guide 2026.
What Grade Should You Actually Buy?
For most people purchasing diamond jewellery — whether an engagement ring, a pendant, or earrings — the practical answer is somewhere between VS2 and SI1 in a well-cut round brilliant or cushion cut. In those cuts, brilliant faceting breaks up light so effectively that inclusions in that range are eye-clean for most people looking at normal viewing distances.
Emerald and Asscher cuts are step-cuts with open, parallel facets that offer little light dispersion to mask inclusions. For those shapes, VS2 is probably the minimum grade where most buyers will feel confident about eye-cleanliness, and VVS2 or better removes any doubt.
The rule gemologists use: always view the stone face-up, in natural or fluorescent light, at approximately 25–30 centimeters, before committing to a grade. If you see nothing without magnification, the inclusions are not affecting the stone’s visual performance.
Putting It Together Before You Buy
Reading a clarity grade well means reading the full report: the grade itself, the clarity plot with its symbols and colors, the comments section, the laboratory that issued the certificate, and the cut grade (which influences how effectively a stone’s brilliance masks its inclusions). None of these exist in isolation.
If you’re shopping for a lab grown diamond — and increasingly, buyers in Hyderabad and across India are making that choice for both value and ethical reasons — the clarity landscape is more favorable than most buyers realize. The controlled production environment means high clarity grades are genuinely common rather than exceptional. Pair that with a strong cut grade and an IGI or GIA report, and you have everything you need to buy with confidence.
For buyers who want to understand how lab grown and mined diamonds compare across all major quality dimensions, or who are curious about how the growth process itself shapes a stone’s internal characteristics, those details are worth exploring before making a final decision. The grading report in your hand tells you what’s there. Understanding diamond formation tells you why.
