VS1 is the ceiling of visible value: the highest grade whose advantages your eye can still collect. Everything above it is certificate territory. Everything below it needs a closer look. VS1 needs neither.
A VS1 diamond contains minor inclusions that are difficult for a skilled grader to see at 10x magnification, most often small crystals or faint feathers positioned away from the center of the stone. Every VS1 diamond is eye clean, without exception and without needing individual verification. That reliability is the grade's entire character.
On the value curve, VS1 marks an inflection: it is the last grade where stepping up buys anything the certificate alone can appreciate, and the first grade where stepping down requires checking the individual stone. Buyers who want certainty without ceremony land here, and they are right to.
Where VS1 sits on the GIA clarity scale. The full scale, grade by grade, lives in our complete clarity guide.
Every clarity decision is really a comparison with the grades on either side. Here is that comparison, made honestly.
Step up for large stones and step cuts where a near-empty interior earns its keep.
Choose VS1 when you want guaranteed eye cleanliness with zero per-stone homework. It is the strongest default on the scale, and the correct floor for emerald and asscher cuts.
Step down for brilliant cuts under two carats; the savings are real and the risk is minimal.
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. Request a ROSI™ Score Report on any diamond, ours or anyone else’s.
VS1 is the recommended floor for step cuts: emerald and asscher interiors are on permanent display, and VS1 keeps them clean without exception. In brilliant cuts it is effectively a luxury, since VS2 and verified SI1 stones achieve the same look for less.
Shape by shape guidance, including face-up size tables and what to demand on each certificate, lives in our shape guides.
VS1 is the last grade your eye can appreciate. Above it, you are collecting paper.
This makes VS1 both a superb choice and a boundary marker. If you are considering anything above it, ask what the additional money buys that the eye can find; the honest answer is rarity and reassurance, not appearance. If you are considering anything below it, the question flips to verification, which is work we do gladly. Standing exactly on the line, VS1 asks nothing and hides nothing.
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, reviews VS1 certificates and stone videos for clients every day. Send him any diamond you are considering and he will tell you what the certificate proves, what it cannot, and what your eye will actually see. The consultation is complimentary and there is no obligation.
1-800-779-1726