Diamond Clarity: Finding an Eye-Clean Stone

Clarity measures how few tiny natural features a diamond has and how hidden they are. Almost every diamond formed with small characteristics: marks inside the stone are called inclusions, and marks on the surface are called blemishes. The GIA clarity scale grades these from Flawless at the top, through Internally Flawless, VVS and VS, down to SI and finally Included, or I1 to I3. Higher grades have fewer and smaller features that are harder to see, and they cost more. The key thing to understand is that most of these features are microscopic, so clarity is really about what a trained grader sees under magnification, not necessarily what you can see with your eye. That gap between graded clarity and visible clarity is exactly where smart buyers find value, by choosing a grade that looks clean without paying for perfection.

Eye-clean means that when you look at the diamond with your naked eye at a normal viewing distance, you cannot see any inclusions or marks. It is the practical goal for most buyers, because a stone that looks flawless to the eye gives you the same beauty as an actually flawless one, for far less money. Clarity grading is done under ten-times magnification, which reveals features you would never notice in daily wear, so a diamond does not need a top grade to look perfectly clean. A VS stone is almost always eye-clean, and many SI stones are too, depending on where their inclusions sit. Because you cannot see what needs magnification to find, chasing a flawless grade mostly buys a number on paper rather than a better-looking ring. Aim for eye-clean and stop there.

VS and eye-clean SI grades usually offer the best value. A VS diamond, meaning very slightly included, is almost always clean to the naked eye, so it looks flawless in wear while costing much less than the top grades. SI, or slightly included, can be even better value when the specific stone happens to be eye-clean, which many are, but here it pays to check the individual diamond or its clarity plot, since SI inclusions vary in size and position. Below that, I-grade stones often have marks you can see, so they are only worth it if you have seen the exact stone and are happy with it. The guiding idea is to buy the lowest grade that still looks clean to your eye, then spend the savings on cut, which does more for beauty.

No, almost no one does. A flawless diamond is rare and priced accordingly, but its advantage over an eye-clean stone exists only under magnification, not in everyday life. Once a diamond looks clean to your naked eye, paying more for a higher clarity grade buys you a better certificate, not a better-looking ring, because you simply cannot see the difference. That money is almost always better spent on cut, which controls sparkle, or on a little more carat. The sensible target is eye-clean: a VS grade nearly always qualifies, and many SI stones do too. Save flawless and internally flawless for collectors who specifically want them. For a ring you will wear every day, an eye-clean diamond with an excellent cut will look every bit as beautiful for a fraction of the price.

Yes, quite a lot, and it is worth factoring in. Step cuts like emerald and Asscher have large, open, mirror-like facets that hide very little, so any inclusions show more easily, and these shapes suit a slightly higher clarity grade to stay clean to the eye. Brilliant cuts like round, oval and cushion, on the other hand, have lots of small sparkling facets that break up light and help disguise small inclusions, so a lower grade such as SI can look completely flawless in these shapes. This means you can often save on clarity with a brilliant cut and should spend a little more on clarity with a step cut. Choose your shape first, then match the clarity grade to it, and always look at the actual stone, which we can arrange in the studio.