VVS1. VVS2. VS1. VS2. SI1. These grades look precise. They describe something real. But the most important fact about diamond clarity — the one most retailers don't lead with — is that most buyers cannot see any difference between them with the naked eye.

How the Clarity Scale Works

Diamond clarity grades measure the presence and visibility of inclusions (internal characteristics) and blemishes (surface characteristics) at 10× magnification under controlled laboratory lighting. The scale runs from Flawless (FL) at the top to Included (I3) at the bottom. What the grade tells you is how hard it is to find inclusions under a loupe — not what you see on someone's hand or ear.

The critical fact: every grade from Flawless through VS2 is eye-clean under normal conditions. You cannot see the inclusions with the naked eye. The visible difference between an FL stone and a VS2 stone on a person's finger is zero. The difference shows up only under 10× magnification in a lab setting.

VVS — Very Very Slightly Included

VVS inclusions are extremely difficult to find even for trained graders at 10× magnification. VVS1 inclusions are located primarily in the pavilion (bottom); VVS2 inclusions may be visible from the face-up position but only after careful searching with a loupe. Under any normal wearing condition — daylight, indoor lighting, fluorescent office lighting, across a room — a VVS stone looks completely clean.

What VVS buys you: Documentation of near-perfect clarity. The certificate says VVS. The stone was selected for exceptional internal quality at the growth phase. For buyers who want the best documented specification, or who care about the technical grade for its own sake, VVS is the rational choice.

What VVS does not buy you: Any visible difference compared to VS1 in normal wear. The eye-clean experience is identical.

VS — Very Slightly Included

VS inclusions are minor and somewhat easier to locate under 10× magnification than VVS. VS1 inclusions are difficult to see even with a loupe; VS2 inclusions are easier to find but still require magnification to locate. Both VS1 and VS2 are universally eye-clean under normal conditions at 1.5 carats and below. At 2+ carats, VS2 warrants closer inspection — larger face-up area means inclusions are more surface-distributed, though still not visible in most practical conditions.

Who should buy VS: Buyers who want a high-clarity certified stone and prefer to allocate savings to cut quality or carat weight. VS1 is the sweet spot: documented top-tier clarity at a meaningful discount from VVS.

SI — Slightly Included

SI inclusions can be found easily under 10× magnification. At SI1, a skilled observer may be able to see inclusions without magnification at 1ct+ stone sizes. At SI2, inclusions are visible to the naked eye in many stones above 0.75ct.

When SI is acceptable: Very small stones (below 0.5ct, face-up area too small for inclusions to read), budget-constrained purchases where the buyer has examined the specific stone and confirmed it's eye-clean, and decorative settings (pave, channel) where small accent stones don't receive direct scrutiny.

When SI is not acceptable: Center stones in solitaire engagement rings, diamond stud earrings at 0.5ct per ear or larger, any stone where the buyer won't examine before purchase. SI is the grade retailers hide behind "eye-clean" language — don't accept this without seeing the stone or reviewing a high-resolution video that shows the inclusions clearly.

Price Differences by Grade

Approximate price premiums for a 1-carat, round brilliant, E color, Excellent cut, IGI-certified lab-grown diamond (2026 market):

Grade	Naked Eye	10× Loupe	Price vs VS1
VVS1	Invisible	Extremely difficult	+20–30%
VVS2	Invisible	Very difficult	+12–20%
VS1	Invisible	Difficult	Baseline
VS2	Invisible (up to ~1.5ct)	Somewhat easy	−8–12%
SI1	May be visible at 1ct+	Easy	−18–30%

What to Buy: The Decision Framework

Diamond stud earrings: VVS1 or VVS2. Studs are worn close to the face and examined frequently. SI is not acceptable. VS is the minimum floor; VVS is the correct target.

Engagement ring center stone: VS1 minimum. A solitaire center stone gets daily scrutiny. VVS is better if budget supports it. SI is risky for any stone above 0.75ct.

Pave or accent stones: VS2 or VS1 is appropriate. These small stones aren't individually scrutinized. SI1 is borderline acceptable for very small melee stones below 0.1ct each.

Budget-sensitive purchase: VS1 is the rational choice — eye-clean, independently certified, and priced sanely. Don't compromise below VS1 on any center stone.

Cut Grade Outranks Clarity — Every Time

A stone's cut determines what happens to light — does it reflect back through the table (brilliance), or leak through the pavilion (dull, glassy appearance)? Clarity determines what the certificate says. If you're choosing between upgrading from VS1 to VVS1 or upgrading from Very Good cut to Excellent cut, upgrade the cut every time. The cut affects every photon that enters the stone. The clarity grade affects what a trained grader sees at 10× in a laboratory.

FAQ

Is VVS clarity worth it?

For documentation value and sourcing quality confidence: yes. For a visible difference on your finger: no. Buy VVS if you want the best documented specification. Buy VS1 if you want an eye-clean stone at a better price and redirect savings to cut or carat.

What's the difference between VVS1 and VVS2?

VVS1 inclusions are visible only from the pavilion face under 10× magnification. VVS2 inclusions may be visible from the face-up under 10×. Neither is visible to the naked eye. Price difference: approximately 8–12% in lab-grown at equivalent specifications.

Are SI diamonds eye-clean?

Some SI1 stones in smaller sizes are eye-clean. Most SI1 stones above 0.75ct have inclusions visible to the naked eye or on a close inspection. SI2 is frequently visible without magnification above 0.5ct. Don't accept "eye-clean SI" from a retailer without verifying the specific stone on video.

Every StudsDirect stone is VVS1, IGI certified, with specific grades on the certificate. Browse the collection — or continue with IGI vs GIA certification and lab-grown vs natural diamonds.