Lab Grown Diamond Guidance

Somewhere between a loupe and a light source, a gemologist peers at a diamond for the first time and begins making notes. They’re not looking at sparkle or colour — they’re cataloguing imperfections. Tiny crystals trapped inside. Microscopic cracks. Pinpoint inclusions barely larger than a molecule. And from this meticulous process comes a single letter-number combination that will influence a diamond’s price more than almost any other factor except carat weight.

Understanding what that grade actually means — not just what the acronym stands for, but what it tells you about how the diamond will look on a finger, in a pendant, or under a chandelier — is worth knowing before you spend a single rupee.

The GIA Scale: Eleven Grades, Three Practical Tiers

The Gemological Institute of America developed the standard clarity grading scale that virtually every major diamond certifier now references. It runs from Flawless at the top to I3 at the bottom, with eleven distinct grades in between. But the honest way to think about them is in three practical tiers: grades you’ll likely never see in a retail setting, grades that form the sweet spot for most buyers, and grades where visible imperfections become a real consideration.

The top tier — FL, IF, VVS1, VVS2 — covers diamonds with inclusions that range from nonexistent to microscopic. A Flawless (FL) diamond has no inclusions or blemishes visible under 10x magnification. An Internally Flawless (IF) stone has no internal inclusions but may have minor surface blemishes. Both grades are so rare that many jewellers never stock them, and for most wearers, the difference between FL and the next grade down is invisible to the naked eye, to a 10x loupe, and honestly to most jewellers without careful inspection.

VVS1 and VVS2 (Very Very Slightly Included) contain inclusions so minute they’re difficult even for trained graders to locate under magnification. A VVS2 diamond on a finger looks identical to an FL to anyone who isn’t a gemologist with proper equipment. These stones command a significant premium over lower grades, which is worth factoring into any decision.

The middle tier — VS1, VS2, SI1, SI2 — is where most engagement rings, necklaces, and fine jewellery actually live. VS (Very Slightly Included) diamonds have inclusions that are minor under 10x magnification but essentially invisible to the naked eye in almost all cases. SI (Slightly Included) stones have inclusions that are noticeable under magnification, and in SI2 diamonds, there’s a reasonable chance a careful observer could spot something without optical aids — though this varies significantly by stone shape, inclusion type, and placement.

The lower tier — I1, I2, I3 — covers Included grades where inclusions are visible to the naked eye. I1 may be acceptable for some applications, particularly in lower-price-point jewellery or side stones, but I2 and I3 diamonds will typically show obvious flaws that affect both appearance and, in some cases, structural integrity.

Inclusions vs Blemishes: The Distinction That Actually Matters

A common misconception is treating all clarity characteristics as the same kind of problem. They aren’t.

Inclusions are internal features — crystals of other minerals trapped during growth, feathers (small fractures), clouds (clusters of pinpoints), needles, knots, or cavities. Because they’re inside the diamond, they can’t be polished away. They’re permanent features of that specific stone.

Blemishes are surface features — scratches, nicks, polish lines, or naturals (unpolished remnants of the original crystal surface). Some blemishes can be addressed through repolishing, though this removes a small amount of material.

The reason this distinction matters practically: a diamond graded IF has no inclusions but might have a tiny surface scratch. That scratch could theoretically be polished out, whereas an included feather cannot. When evaluating diamonds, ask specifically whether the characteristics affecting the grade are internal or external — a blemish-only downgrade is often less consequential than an inclusion-based one.

Eye-Clean: The Term Every Buyer Should Know

The industry term “eye-clean” refers to a diamond where inclusions are invisible to the naked eye at normal viewing distance (approximately 25–30 centimetres). It’s not an official GIA grade — it’s a practical assessment that often matters more than the actual grade printed on the certificate.

Here’s where things get nuanced: not all SI1 diamonds are eye-clean, and not all VS2 diamonds are. The position, type, and colour of an inclusion matters as much as its size. A dark crystal inclusion sitting directly under the table facet of a round brilliant will be more visible than a white feather tucked near the girdle, even if both diamonds carry the same SI1 grade. Similarly, emerald cuts and Asscher cuts — with their parallel facet arrangements — tend to reveal inclusions more readily than brilliant cuts, which scatter light in ways that mask imperfections.

As a general rule, most VS1 and VS2 diamonds are reliably eye-clean. Most SI1 diamonds are eye-clean, but it’s worth examining them individually. SI2 diamonds require case-by-case evaluation. This is one reason why buying from a jeweller who allows you to view the actual stone — rather than just the certificate — remains valuable even in an era of online retail.

How Clarity Grading Works for Lab Grown Diamonds

Lab grown diamonds are graded on exactly the same GIA scale as mined stones. The physical characteristics being assessed are identical — because lab grown diamonds are chemically and structurally identical to mined diamonds. The inclusions that form in CVD-grown diamonds tend to be different in character from those in HPHT-grown stones, and different again from the typical inclusions in mined diamonds, but a cloud is still a cloud, and a feather is still a feather under the grader’s loupe. If you’re curious about how the growth process affects the types of characteristics that appear, the comparison of HPHT vs CVD manufacturing methods covers this in detail.

One practical difference: because lab grown diamonds can be produced under controlled conditions, high-clarity stones are more consistently available than they are in mined diamond supply chains. This means buyers shopping for VS or better clarity in lab grown stones don’t face the same scarcity premium that applies to mined diamonds at equivalent grades. At Elevé Diamonds, which brings over a century of Tibarumal’s gemological expertise to its lab grown collections, VS clarity and above tends to be accessible at price points that would be considerably higher in mined stone equivalents of comparable cut and carat.

The Clarity-Cut Interaction Nobody Talks About Enough

Clarity grades are graded on a standardised basis, but the way a diamond is cut affects how visible those inclusions actually are in practice.

Round brilliant cuts, which have 58 facets directing light in multiple directions, are the most forgiving of inclusions. The light performance essentially camouflages moderate imperfections. Princess cuts and oval brilliants are similarly forgiving. But step cuts — emerald, Asscher, baguette — are intentionally designed to be transparent, showcasing the interior of the stone. The same SI1 inclusion that disappears in a round brilliant can be quite apparent in an emerald cut.

This interaction means that if you’re drawn to a step-cut stone, it’s worth considering VS2 as a minimum grade. For brilliant cuts, an eye-clean SI1 can be a genuinely intelligent choice that frees budget for a larger carat weight or better colour grade. Understanding this relationship is part of what it means to choose a lab grown diamond and maximise its benefits rather than just collecting numbers from a certificate.

Does Clarity Affect Durability?

For the grades most buyers will encounter — FL through SI2 — clarity has minimal practical effect on durability in everyday wear. The concern about structural integrity really only becomes relevant at I1 and below, where larger feathers and fractures can, in specific circumstances, make a diamond more vulnerable to impact.

A VS1 diamond and an SI1 diamond will both score 10 on the Mohs hardness scale. Both will resist scratching from everything except another diamond. The feather inclusion in the SI1 stone isn’t going to cause the diamond to crack during normal wear. Where this changes is in extreme scenarios — a hard direct blow at the right angle, which is uncommon but not impossible. The factors that affect diamond durability go well beyond clarity grade and include the diamond’s setting, the cleavage planes of the specific crystal, and how the stone is worn. Avoiding I2 and I3 grades in rings worn daily is sensible; obsessing over VS1 versus VS2 for durability reasons is unnecessary.

Making a Decision

The clarity grade that actually makes sense depends on three variables in combination: the cut shape you’re choosing, the carat weight you’re targeting, and the viewing conditions in which the piece will typically be worn. A 1.5ct emerald cut in an engagement ring warrants VS2 or better. A 0.8ct round brilliant tucked into a pendant that won’t be examined under a loupe can be an eye-clean SI1 without any visual compromise.

Certificate in hand, the most useful question to ask is not “what grade is this?” but “can I see anything from 30 centimetres?” That’s the view the world will have of this stone for decades. The grader’s loupe is a useful tool for establishing grade — it’s not how anyone will look at the diamond once it’s on a finger.

For anyone navigating lab grown diamond quality standards and certification more broadly, clarity is one of the four Cs — but in practice, for lab grown stones available at Elevé Diamonds, it’s the C where you’re least likely to have to compromise. The controlled production environment and the price accessibility of lab grown stones mean that reaching VS clarity doesn’t require stretching a budget the way it does in mined stone categories.

The eleven grades on the GIA scale are a precise vocabulary for a subtle science. Once you understand what each one actually describes — and, more importantly, what it means for how the diamond looks and performs in real conditions — the decision becomes much clearer.