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Diamond Clarity Explained: VVS, VS, SI and What Eye-Clean Actually Means
What Clarity Measures
Diamond clarity is a grade assigned by gemological laboratories to describe the presence and visibility of internal characteristics (inclusions) and surface blemishes in a diamond. The GIA clarity scale runs from Flawless (FL) — no inclusions or blemishes visible under 10x magnification — down to Included 3 (I3), where inclusions are obvious to the naked eye and may affect durability.
Most diamonds used in fine jewellery fall in the VS1 to SI2 range. Understanding what each grade actually looks like — not just what the letters mean in theory — is what makes this useful.
The Grade Ranges in Practice
FL and IF (Flawless / Internally Flawless). No inclusions visible under 10x magnification; IF may have minor surface blemishes. These are the rarest grades and carry significant premiums. The visual difference between an IF and a VVS1 is imperceptible without magnification. FL and IF grades are for buyers who specifically want the certificate to reflect the highest grades, not for those optimising for visible beauty.
VVS1 and VVS2 (Very Very Slightly Included). Inclusions are present but extremely difficult to see even under 10x magnification. Invisible to the naked eye in virtually all conditions. VVS stones are an excellent choice for step-cut diamonds (emerald, Asscher) where the open facets show inclusions more readily — the VVS grade ensures a clean appearance in the most transparency-revealing cuts. For round brilliants, the VVS premium is rarely justified by a visible difference.
VS1 and VS2 (Very Slightly Included). Inclusions are minor and difficult to see under 10x magnification. VS1 and VS2 are typically eye-clean across all diamond cuts and sizes. VS2 represents the best value-to-cleanliness ratio for most brilliant cut diamonds: the inclusions are not visible to the naked eye, and the price is meaningfully lower than VVS. VS1 is the safe choice for emerald cuts above 1.50ct where the open facets may reveal a VS2 inclusion at larger scale.
SI1 and SI2 (Slightly Included). Inclusions are noticeable under 10x magnification and may be visible to the naked eye, depending on the inclusion type, location, and the stone's size and cut. SI1 in a round brilliant can often be eye-clean — the brilliance of the cut masks inclusions effectively. SI2 is more variable: some SI2 round brilliants are eye-clean; others have obvious inclusions. SI grades in step cuts (emerald, Asscher) are almost always visibly included and generally not appropriate for these shapes above modest sizes.
I1, I2, I3 (Included). Inclusions are obvious to the naked eye and may affect the stone's durability. Not appropriate for fine jewellery engagement rings intended for daily wear.
What "Eye-Clean" Actually Means
"Eye-clean" is not an official GIA grade. It is a description used in the trade to indicate that a diamond's inclusions are not visible to the naked eye under normal viewing conditions (no magnification, reasonable lighting, normal viewing distance of about 30cm). It is useful shorthand but requires verification — a stone described as eye-clean should be confirmed by viewing the stone face-up in person, not just accepted on the description alone.
For round brilliants: VS2 and above are virtually always eye-clean. SI1 is often eye-clean. SI2 varies and must be checked. For emerald and Asscher cuts: VS1 or above is the practical minimum for reliable eye-cleanliness.
Inclusion Position Matters
The clarity grade does not tell you where an inclusion is located. A VS2 with a tiny crystal inclusion directly under a prong (where it will be hidden by the setting) is effectively a cleaner-looking stone than a VS2 with an inclusion at the centre of the table. Similarly, an inclusion at the edge of a brilliant cut diamond, where it will be masked by light reflection, is less visible than a similar inclusion at the culet (bottom point), which can be reflected by the facets and appear to multiply.
This is why inspecting the clarity plot on a GIA report and, where possible, viewing the stone directly, is more valuable than simply selecting a grade tier.
The Practical Recommendation
For round and oval brilliant cuts: VS2 is the sweet spot for most buyers. It is reliably eye-clean, well-documented, and significantly more affordable than VVS grades for no visible difference. SI1 is worth considering if the budget is tight and the stone can be inspected directly.
For emerald and Asscher cuts: VS1 minimum. VS2 in step cuts requires careful inspection and is not a guaranteed eye-clean grade at larger sizes.
Redirect any clarity budget saved by choosing VS2 over VVS2 toward cut quality. The difference between an Excellent and a Good cut is clearly visible; the difference between VVS2 and VS2 is not.
Book a consultation to discuss diamond selection and clarity in the context of your brief, or message us on WhatsApp with any questions.