Diamonds
Diamond Clarity: From Flawless to Included, What Matters on the Hand
Clarity grades measure what is inside a diamond; the ring wearer sees what is on top of it — and those two perspectives diverge in ways that the industry rarely explains clearly.
The GIA Clarity Scale
What Each Grade Actually Measures
GIA’s (Gemological Institute of America) clarity scale has eleven grades across six categories. Flawless (FL) and Internally Flawless (IF) contain no inclusions and no blemishes visible under 10x magnification, respectively. VVS1 and VVS2 (Very Very Slightly Included) contain inclusions that are extremely difficult to see even for an experienced grader at 10x. VS1 and VS2 (Very Slightly Included) contain inclusions that are difficult but possible to see at 10x. SI1 and SI2 (Slightly Included) contain inclusions that are noticeable at 10x and may be visible to the naked eye. I1, I2, and I3 (Included) contain inclusions clearly visible to the naked eye that may affect transparency and brilliance.
The entire grading is conducted at 10x magnification under standardized lighting. This is important to keep in mind: 10x magnification is approximately what a jeweler’s loupe provides, and it is far more powerful than naked-eye viewing. An inclusion that fills the field of view at 10x magnification may be completely invisible when the stone is viewed normally at arm’s length.
The type, size, number, position, and color of inclusions all factor into the grade. A large feather — an internal fracture — at the center of the table in a VS1 stone might have placed it in SI1 in a different position. A cluster of small, off-center crystals in an SI1 might be harder to see face-up than the feather in the VS1. The grade is a summary, not a complete picture of the stone’s visual appearance.
What Eye-Clean Means
The Standard That Actually Matters for Wearers
An “eye-clean” diamond has no inclusions visible to the unaided eye when the stone is viewed face-up from a normal viewing distance of about 12 to 15 inches. This is the practical clarity standard for any ring that will be worn and observed in daily life. A stone that is eye-clean grades no differently on the hand than a flawless stone, regardless of what the certificate says.
Flawless and Internally Flawless diamonds trade at extraordinary premiums — often 30 to 50 percent above comparable VS1 stones — for a quality improvement that no observer will detect in normal use. The premium exists because collectors value rarity and the certificate, not because the ring will look different. For clients who are buying jewelry to wear and enjoy, this is a straightforward misallocation of budget.
The eye-clean threshold by shape and size follows predictable patterns. Round brilliants are the most forgiving shape for clarity: the brilliant-cut facet pattern masks inclusions efficiently, and SI1 rounds are frequently eye-clean. In SI2 territory, round brilliants can sometimes still be eye-clean, but this requires individual evaluation — the grade alone is not sufficient assurance. Fancy shapes with large open tables — emerald and asscher cuts, specifically — reveal inclusions more directly and typically require VS2 or better to be reliably eye-clean. Ovals, pears, and marquise shapes fall between these poles.
Inclusion Types
Which Features Matter More Than Others
Not all inclusions are equal. A small, colorless cloud (a diffuse group of tiny pinpoints) in the lower pavilion of an SI1 round brilliant affects the grade but will be functionally invisible in the finished ring. A dark crystal inclusion centered under the table of a VS2 stone may be more visually apparent than the cloud and can potentially affect brilliance by creating a dark spot in the face-up view. The certificate tells you the worst thing it found; it does not tell you whether that worst thing is visually relevant.
Feathers — internal fractures — deserve attention beyond their clarity grade impact. A feather near the girdle of a stone can be a vulnerability to chipping if the stone receives a hard impact in that location. The risk is not high in normal daily wear with a protective setting, but it is worth knowing about. A grader at your jeweler can assess whether a feather’s location creates meaningful wear risk.
Inclusions that affect brilliance directly — dark crystals, heavy twinning wisps, or broad feathers running through the stone’s center — should be avoided regardless of the clarity grade assigned. Inclusions that sit in the pavilion below the main facets, or near the girdle away from the table center, rarely have any visual consequence.
Buying Strategy
Where Clarity Budget Is Well Spent
For round brilliant diamonds, the VS2 grade is a solid, reliable choice that delivers eye-clean clarity across all sizes without the premium of VS1, VVS, or Flawless grades. The savings can be redirected to cut quality or color. For step-cut shapes — emerald, asscher, baguette — VS1 is the practical floor, and VVS2 or better is worth considering in larger stones where the open table is very revealing.
SI1 round brilliants can be purchased at excellent value if each stone is evaluated individually by a qualified professional before purchase. Blanket SI1 acceptance based on grade alone is not advisable; specific SI1 stones with colorless, off-center inclusions are fine, while centrally located or dark inclusions in SI1 grade should be declined regardless of price.
What People
Ask Us
What clarity grade should I buy for an engagement ring? For round brilliants, VS2 is the standard recommendation that most clients find optimal — eye-clean, certified, and meaningfully less expensive than higher grades. For step cuts and fancy shapes, VS1 is the floor. If budget allows, VS1 for round brilliants and VVS2 for step cuts provides additional margin against any visible inclusions.
Is a flawless diamond worth buying? Only if you are collecting rather than wearing. A Flawless diamond is a rarity certificate — it means the stone was perfect under a highly trained grader’s 10x examination. On the hand, it looks identical to a VS1. The 30 to 50 percent premium buys you the certificate and the bragging rights, not a different daily experience.
Can inclusions affect a diamond’s durability? In most cases, no. The vast majority of inclusions are cosmetic — they affect appearance grades, not structural integrity. The exception is large feathers or cleavage fractures that reach the surface or traverse the stone’s center. These are rare in VS and above grades but can appear in SI2 and included diamonds. Have any large feather evaluated by a professional for position and orientation before purchase.
What is the difference between VS1 and VS2? Both grades contain inclusions that are difficult to see at 10x magnification. VS1 inclusions are slightly harder to locate than VS2 inclusions, and VS1 stones occasionally have fewer total inclusions. The practical difference in most settings is negligible. The price difference between VS1 and VS2 in a given color and cut grade is typically 10 to 15 percent — a meaningful saving that can be redirected usefully.
Do lab-grown diamonds have the same clarity grades? Yes. Lab-grown diamonds are graded on the same GIA clarity scale as natural diamonds and receive the same FL through I3 grades based on the same microscopic evaluation. Lab-grown diamonds often occur at higher clarity grades because the growth environment can be more controlled than natural geological conditions, but inclusions specific to growth methods — metallic flux inclusions in HPHT stones, for example — are also present and graded accordingly.
Continue Reading
- The Diamond Color Grade: What D Through Z Actually Means
- Diamond Fluorescence: Asset, Liability, or Neither
- Diamond Inclusions: Types, Visibility, and What to Avoid
Explore the Bez Ambar diamond education guide.
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