Diamond Knowledge

Eye-Clean Clarity: Which Inclusions Matter

You rarely need a flawless diamond — you need one that looks flawless to the eye. That is what "eye-clean" means, and it is where clever buyers save.

← Part of the Brilliani Labs Diamond Guide

What does "eye-clean" mean?

An eye-clean diamond is one whose inclusions cannot be seen by the naked eye at a normal viewing distance — roughly arm's length — under ordinary lighting. It is a practical idea rather than a grade on a report: it describes what you can actually see, not what a microscope can find. A stone can have inclusions noted on its report and still be perfectly eye-clean, because those features are simply too small or too well-placed to notice without magnification.

What are the clarity grades again?

Briefly, the clarity scale runs from Flawless and Internally Flawless at the top, then through VVS (Very, Very Slightly Included), VS (Very Slightly Included), SI (Slightly Included) and finally I (Included). Each step describes how easy the inclusions are to see under 10x magnification. For the full scale and what each grade means, see the Diamond Guide.

Which clarity grade is eye-clean?

VS2 and above are usually eye-clean. Many SI1 stones are eye-clean too, and some SI2 stones are as well — but at SI it is not guaranteed and depends on the individual diamond. The grade tells you how the inclusions look under magnification, not how they look to your eye, so always check the specific stone rather than trusting the grade alone.

Do I need a Flawless diamond?

No. Flawless and Internally Flawless diamonds command large premiums for their rarity, not for any visible difference — to the eye, an eye-clean stone several grades down looks the same. An eye-clean VS or SI gives you that same look for considerably less, which is exactly why so much value sits in the middle of the scale.

Which inclusions matter most?

Three things decide how much an inclusion shows. Position matters most — an inclusion sitting under the table (the large flat facet on top) is far more visible than one tucked near the girdle at the edge. Size is the obvious one: bigger inclusions are easier to spot. And contrast counts — a dark or coloured crystal stands out far more than a pale, transparent one. Type matters too, but most inclusions are purely cosmetic.

Are inclusions bad — do they weaken a diamond?

Most inclusions are simply part of the stone's character and have no effect on its durability. The one exception worth knowing is a large feather — a small internal fracture — that reaches the surface, which can be a genuine durability concern. A grading report flags these, and a jeweller can advise you on any stone where it might matter.

Does the diamond's size change what's eye-clean?

Yes. Larger diamonds have bigger facets and a bigger table, so the same inclusion is easier to spot in a large stone than a small one. A clarity grade that is reliably eye-clean at half a carat may not be at two carats, so the bigger the diamond, the more it pays to check the actual stone rather than lean on the grade.

How do I check if a diamond is eye-clean?

Look at it — or a high-resolution image of it — at a normal distance in good light, paying particular attention to the area under the table, where inclusions show most. A loupe is useful for finding an inclusion in the first place; once you have, step back and judge whether you can still see it by eye. If you cannot, the stone is eye-clean for you.