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SI1 is the smart buyer's grade. Its inclusions are noticeable under magnification, and in the right stones, invisible without it. Finding those stones is a craft, and the reward is the best value on the entire clarity scale.
An SI1 diamond carries inclusions a skilled grader notices readily at 10x magnification: crystals, feathers, clouds, or wisps of meaningful size. What the grade does not tell you is where they sit, and location is everything. An SI1 whose grade-setting inclusion hides near the girdle, under a future prong, or in the scintillation of a brilliant cut can be perfectly eye clean. One whose dark crystal sits under the table cannot.
That variability is exactly why SI1 is the value grade: the market prices the category, not the individual stone. Buyers who can verify eye cleanliness, or who have a gemologist to do it, routinely secure stones that look identical to VS grades at a meaningful saving, and redirect the difference into carat, color, or cut where it shows.
Where SI1 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 if you want near-certain eye cleanliness without reviewing individual stones.
Choose SI1 with verification, and it is the best value in diamonds. The grade cannot find the good ones for you. We can, and we do it every day.
Step down only with expert selection and preferably under one carat in a brilliant cut.
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.
SI1 belongs in brilliant cuts, where the hall-of-mirrors faceting actively conceals inclusions: rounds, ovals, cushions, and radiants hide SI1 characteristics best. We do not recommend SI1 for emerald or asscher cuts, whose open facets display precisely what this grade needs hidden, and above two carats every SI1 needs individual review regardless of shape.
Shape by shape guidance, including face-up size tables and what to demand on each certificate, lives in our shape guides.
A verified eye clean SI1 is the best value in diamonds. The word doing the work in that sentence is verified.
The SI1 category contains both the smartest buys on the market and stones we would never set. The certificate cannot tell you which is which; the plotting diagram and the video can. That verification is the entire game at this grade, and it is precisely the work our gemologists do before an SI1 ever reaches a recommendation. Bring us any SI1 you are considering, ours or anyone else's, and we will tell you honestly which kind you have found.
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 SI1 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