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Clarity is the C buyers fear most and understand least. The truth is friendlier than the grading scale suggests: past a certain point, higher clarity buys rarity on paper, not beauty on the hand. This guide shows you exactly where that point is.
Clarity is one of the 4Cs, and it measures the presence, size, and visibility of a diamond's internal and surface characteristics. Gemologists divide them into two families. Inclusions are enclosed within the stone: tiny crystals of other minerals, fine internal lines, or growth features captured while the diamond formed under immense heat and pressure. Blemishes sit on the surface, usually introduced during cutting, polishing, setting, or wear.
Neither family is a defect in any meaningful sense. Diamonds completely without these characteristics are so rare that most jewelers never handle one in a career. Think of them as the stone's fingerprint: no two diamonds carry the same pattern, and the pattern is mapped precisely on every grading report.
Clarity touches beauty, value, and durability, and the mistake most buyers make is treating those as one thing. They are not. Severe inclusions can interrupt light and dull a stone, but the vast majority in gem quality diamonds are far too small to affect beauty without magnification. Value, meanwhile, follows rarity: a Flawless stone costs dramatically more than a VS2 that looks identical to the naked eye, because you are paying for scarcity, not visible improvement. Durability is the narrow exception: certain characteristics in certain locations, chiefly a feather reaching the surface near the girdle or a sharp point, can create a weak spot, which is precisely why every stone deserves a gemologist's read of its plotting diagram before purchase.
Once you separate those three, the strategy writes itself: spend on what you can see, verify what you cannot, and decline to pay for rarity that delivers nothing to the eye.
GIA grades clarity under 10x magnification against five factors: the size, number, position, nature, and relief of the characteristics. Eleven grades result. Here is each one, with our unvarnished read of who should buy it. Each grade links to its own full guide.
| Grade | What the Lab Sees at 10x | To the Naked Eye | Our Honest Read |
|---|---|---|---|
| FL | Nothing, inside or out | Always eye clean | The collector's choice. Fewer than one in two thousand gem diamonds qualify. You are buying rarity itself. |
| IF | Only trivial surface marks | Always eye clean | Internally perfect. For the purist; visually identical to grades far below it. |
| VVS1 | Extremely difficult to find | Always eye clean | Exceptional on paper. Peace of mind under any microscope. |
| VVS2 | Very difficult to find | Always eye clean | The quiet high end. A popular choice for buyers who want superb clarity without the Flawless premium. |
| VS1 | Difficult to find | Always eye clean | The no compromise value. Indistinguishable from everything above it once set. |
| VS2 | Somewhat easy to find | Almost always eye clean | The most popular grade on the market, and deservedly so. Beauty and budget meet here. |
| SI1 | Noticeable | Often eye clean, must be verified | The smart buyer's grade. A verified eye clean SI1 is the best value in diamonds, and finding one is our specialty. |
| SI2 | Easy to find | Sometimes eye clean | Possible, with expert selection. The stone must be reviewed individually; the grade guarantees nothing either way. |
| I1 to I3 | Obvious, may dull the stone | Usually visible | We do not recommend these for center stones. Visible inclusions cost beauty and can cost durability. |
An eye clean diamond shows no inclusions to the naked eye, viewed face up at normal distance. That is the standard that governs how your diamond actually looks for the rest of its life, and it does not map neatly onto the grading scale. It is why the smartest money in diamonds concentrates in three grades.
Every grade from VS1 up is eye clean by definition. The premiums above that line purchase certificates, not appearance. Pay them only if rarity itself is the point.
Almost always eye clean, meaningfully more accessible than VVS, and abundant enough to be selective about cut. The default recommendation for good reason.
SI1 stones that happen to carry their inclusions where prongs and pavilion hide them look identical to VS stones and cost noticeably less. The grade cannot find them for you. A gemologist can.
Every stone we recommend is scored by ROSI™, our gemological intelligence, built by our gemologists, with clarity verified by a human eye against the actual stone, not the paper. Request a ROSI™ Score Report on any diamond you are considering, ours or anyone else’s.
Every grading report includes a plotting diagram, a map of the stone's characteristics. Red marks are internal, green marks are surface. Learning even a little of this language changes how you shop, because the location of the grade setting inclusion matters more than the grade itself. An SI1 with a transparent crystal tucked under a future prong is a better buy than a VS2 wearing a dark crystal dead center under the table.
A speck so small it barely registers at 10x. The most benign characteristic a diamond can carry. A few scattered pinpoints affect nothing.
A fine, thread thin crystal. Invisible to the eye on its own; only a dense cluster can create haze worth checking.
A trapped mineral, sometimes a microscopic diamond inside the diamond. Small and colorless: benign. Large or dark, under the table: the one to walk away from.
A cluster of pinpoints too small to distinguish. Faint clouds are irrelevant; a large dense cloud can make a stone read hazy or milky and is worth avoiding.
A small internal fracture. Enclosed feathers are usually harmless. A feather breaking the surface near the girdle or a point is a durability question, and a gemologist should answer it before you buy.
Openings on the surface, from polishing or impact. Small ones are cosmetic; larger ones trap oil, show over time, and can weaken an edge.
A ribbon of mixed characteristics left by irregular crystal growth. Faint wisps are hard to find even with a loupe; only bold ones earn attention.
A sliver of the rough crystal's original skin left on the girdle. Confined there, it changes nothing and signals a cutter who preserved weight with intent.
Faceting decides how much a shape hides. Brilliant cuts chop light into a hall of mirrors that conceals small characteristics beautifully. Step cuts do the opposite: their long open facets are a window, and everything inside is on display. Match your clarity floor to your shape.
| Shape | Faceting | How Well It Hides | Our Recommended Floor |
|---|---|---|---|
| Round | Brilliant | Excellent | SI1, verified eye clean |
| Oval, Cushion, Radiant | Brilliant | Excellent | SI1, verified eye clean |
| Princess, Pear, Marquise | Brilliant | Good | VS2, verified eye clean |
| Emerald | Step cut | Poor, by design | VS2 |
| Asscher | Step cut | Poor, by design | VS1 |
Floors are starting guidance, not law. An individual stone always outranks its category; that is the whole argument for reviewing the exact diamond.
Past eye clean, every additional clarity grade buys you a rarer certificate, not a more beautiful diamond.
The premium between a VVS1 and a well chosen eye clean SI1 of the same cut, color, and weight is money the eye will never see again. Redirect it and it becomes visible: a stronger cut, a whiter color, a larger stone, or a more considered setting. That is not a compromise. It is spending on what exists on the hand rather than on paper. If owning rarity for its own sake matters to you, the Flawless category exists for exactly that, and we will find you one. We simply will not pretend the two paths look different across a dinner table.
Found a diamond you are considering, here or anywhere else? Send the GIA or IGI certificate number and our gemological team returns its ROSI™ Score and a read of where it sits in the current market. Complimentary, within minutes.
Score a DiamondWhere stones of the same exact specifications are trading on the open market right now. You get a straight answer, even when the diamond is not ours.
John Anderson, our Lead Gemologist, reads plotting diagrams and stone videos for clients every day. Send him the certificate of any diamond you are considering and he will tell you where the grade setting inclusion sits and whether your eye will ever find it. The consultation is complimentary and there is no obligation.
1-800-779-1726