Clarity is where most diamond budgets leak. It is graded by a trained eye under ten times magnification, described with initials that sound like a school report, and then sold as though each step up were visible. Almost none of it is.
There is exactly one threshold that matters to a person wearing a ring, and it is not on the chart.
The scale, briefly
- FL / IF — Flawless and Internally Flawless. Nothing under 10x.
- VVS1 / VVS2 — Very Very Slightly Included. A skilled grader struggles to find it.
- VS1 / VS2 — Very Slightly Included. Visible under 10x, not to the eye.
- SI1 / SI2 — Slightly Included. Easy under 10x. Sometimes visible to the eye.
- I1 / I2 / I3 — Included. Usually visible, and often affecting brightness.
Every grade above VS2 describes something you cannot see without equipment. You are buying a sentence on a report.
The only threshold that matters: eye-clean
A diamond is eye-clean when a person with normal vision, holding it at normal distance, sees no inclusion. That is the line. Above it, extra clarity buys nothing visible. Below it, no amount of colour or carat compensates.
Eye-clean is not a grade, which is the frustrating part — it is a property of the individual stone. In practice:
- VS1 and VS2 are eye-clean, essentially always.
- SI1 is eye-clean most of the time, and this is where the best value in the whole clarity scale sits.
- SI2 is sometimes eye-clean, depending entirely on where the inclusion is.
- I1 and below rarely are, and we do not recommend them.
Position beats grade
Two SI1 stones can look completely different. What separates them is where the inclusion sits and what kind it is.
- Under the table — dead centre, seen through the largest flat facet. The worst place. A small inclusion here is more visible than a larger one elsewhere.
- Near the girdle — the rim. Often hidden entirely by the prongs of the setting. The best place.
- Spread out — several small marks scattered around read as less obvious than one concentrated dark crystal, even at the same grade.
Type matters too. White or transparent feathers and clouds are far less noticeable than a dark carbon crystal of the same size. This is why the plotted diagram on a certificate is worth more than the grade letter, and why we show the full report on every product page.
Shape changes everything
Brilliant cuts scatter light in every direction and that scattering hides inclusions. Step cuts do not scatter — they reflect in long clean planes, and anything inside is on display.
- Round, oval, cushion, pear, marquise, radiant, heart — brilliant faceting. SI1 is realistic, often SI2.
- Emerald and asscher — step cuts. Go VS2 or better. This is the one place we would tell you to spend on clarity rather than save.
Size compounds it. An inclusion that disappears in a 0.70 carat stone is proportionally larger and more findable in a 2.00 carat one, so the sensible clarity floor rises with weight.
What we would actually buy
For a brilliant-cut stone up to about 1.50 carats: SI1, checked to be eye-clean, with the inclusion away from the centre. For 2 carats and up: VS2. For an emerald or asscher cut at any size: VS2 or better.
The money that decision releases has one proper destination, and it is cut. A well cut SI1 outperforms a badly cut VVS2 in every way that a person standing in front of you can perceive.
How to check before you buy
Read the plot on the certificate, look at where the marks are, and look at the stone itself — our product pages carry high resolution images and 360° views for exactly this reason. If you want a second opinion on a specific stone before ordering, write to us and we will tell you honestly what we see. We would rather talk you out of one stone than take a return.
Where to look
- Diamonds under $1,000 and $1,000 to $2,500 — the ranges where clarity choices change what you can afford
- Rounds, ovals and cushions — the forgiving shapes
- The 4Cs explained and the full buying guide
Free insured shipping worldwide at any order value, and 30 days to return the stone in its original condition with its certificate.
