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Short answer: SI1 (Slightly Included 1) diamonds have inclusions that are noticeable at 10x magnification and, in some larger stones, visible to the naked eye. VS1 (Very Slightly Included 1) diamonds have minor inclusions that are very rarely visible without magnification. A carefully chosen "eye-clean" SI1 can look identical to a VS1 in brilliant cuts like round, oval and pear, and it costs less. Choose VS1 for step cuts, larger stones or peace of mind; choose an eye-clean SI1 to stretch your budget toward a better cut or a bigger stone.
Clarity is the grade that worries buyers most, because it sounds like a measure of quality you can see. In practice, most clarity differences are only visible under a loupe. SI1 and VS1 sit two steps apart on the scale, and that gap is exactly where the biggest savings and the biggest mistakes happen. This guide explains what each grade really means, when the difference shows, how to choose a good SI1 and when VS1 is worth paying for.
SI1 vs VS1 at a Glance
| Feature | SI1 | VS1 |
|---|---|---|
| Inclusions at 10x | Noticeable | Minor, hard to find |
| Eye-clean? | Often, not always | Almost always |
| Price | Lower | Higher |
| Best shapes | Round, oval, pear, cushion, radiant, marquise | Any, including emerald and asscher |
| Best sizes | Under about 1.5 ct | All sizes |
| Needs inspection? | Yes, check photos or video | Less critical |
| Best for | Value-focused buyers | Buyers who want certainty |
Where SI1 and VS1 Sit on the Clarity Scale
Diamond clarity is graded by how many inclusions (internal features) and blemishes (surface features) a trained grader can see at 10x magnification, and how big, dark and well placed they are. The standard scale used by GIA and IGI runs from best to lowest:
- FL and IF: Flawless and Internally Flawless. No inclusions visible at 10x.
- VVS1 and VVS2: Very, very slightly included. Inclusions are extremely hard to see even at 10x.
- VS1 and VS2: Very slightly included. Minor inclusions, difficult to somewhat easy to see at 10x.
- SI1 and SI2: Slightly included. Inclusions are noticeable at 10x and may be visible to the eye in some stones.
- I1, I2 and I3: Included. Inclusions are obvious and can affect beauty and durability.
So VS1 sits in the middle of the "very slightly included" range, and SI1 is the top of the "slightly included" range, with VS2 in between. The same scale applies to lab grown and mined diamonds, because they are chemically, physically and optically the same material.
VS2: the middle ground
If you are torn between SI1 and VS1, look at VS2. It sits between them and is one of the most popular grades for engagement rings, because VS2 stones are almost always eye-clean in brilliant cuts while costing less than VS1. For a larger brilliant-cut stone, or for buyers who cannot inspect a video closely, VS2 is often the sweet spot between value and certainty.
What the Difference Looks Like in Real Life
Under a loupe, a VS1 diamond usually needs searching. The grader may find a tiny crystal or a small feather, but it takes effort. In an SI1, the grader can usually find the main inclusion quickly at 10x.
Without magnification, at a normal viewing distance, most VS1 stones look completely clean, and many SI1 stones do too. The key word is "many". SI1 is a broad grade: one SI1 may have a tiny white crystal near the edge that nobody will ever see, while another has a dark crystal right under the table that you can spot across a table.
This is why two SI1 diamonds with the same certificate can look very different. With VS1, the range is much narrower, so you can buy with less inspection.
What Makes an SI1 Eye-Clean (or Not)
A stone is called "eye-clean" when you cannot see any inclusions with the naked eye from about 25 to 30 cm, face up. Whether an SI1 is eye-clean depends on four things:
- Size: Larger inclusions are easier to see. A large inclusion is more likely in a large stone.
- Colour: Dark or black inclusions stand out; white or transparent ones blend in.
- Position: Inclusions under the table (the large top facet) are the most visible. Those near the girdle or edges are often hidden by prongs or by the stone's sparkle.
- Type: Small crystals and pinpoints are usually harmless. Large feathers that reach the surface are worth avoiding.
Common inclusion types
| Inclusion | What it is | Concern in SI1? |
|---|---|---|
| Pinpoint | A tiny crystal, like a speck of dust | Rarely; almost invisible |
| Crystal | A small mineral or diamond crystal inside the stone | Only if dark and central |
| Cloud | A group of pinpoints close together | Large clouds can make a stone look hazy |
| Feather | A small internal crack | Avoid large ones that reach the surface |
| Needle | A long, thin crystal | Usually minor if white |
| Indented natural or chip | A surface blemish near the girdle | Often hidden by the setting |
Inclusions in lab grown diamonds
Lab grown diamonds can have inclusions too, because growth is never perfect. CVD diamonds may show small dark pinpoints or graphite specks, and HPHT diamonds can contain small metallic inclusions from the growth process. They are graded on exactly the same scale, so an SI1 lab diamond and an SI1 mined diamond have a similar level of inclusions. What matters is the same as always: size, colour, position and type.
How to Pick an Eye-Clean SI1
- Look at magnified photos or videos: Every stone is different, so judge the stone, not just the grade.
- Prefer edge inclusions: Choose stones whose inclusions are near the edges, not under the table.
- Prefer light inclusions: White or transparent inclusions are far less visible than dark ones.
- Avoid large surface-reaching feathers: They can be a weak point if the stone is knocked.
- Read the certificate plot: Many certificates include a diagram showing where inclusions are.
- Ask for a second opinion: A good jeweler will tell you honestly whether an SI1 is eye-clean.
How to read the clarity plot
Many grading reports include a plot: an outline of the diamond from the top and bottom with symbols marking each inclusion. Red symbols usually mark internal features, and green symbols mark surface blemishes. Look at where the marks sit. Marks clustered near the edge of the top view are good news; a mark in the middle of the table is the one to check on video. The report also lists "key to symbols", which tells you the main inclusion types that set the grade. A report listing only "crystal" or "pinpoint" is usually reassuring; a long "feather" in the key is worth a closer look.
Read diamond inclusions explained for a closer look at each type.
Tip: Ask the seller one direct question: "Is this stone eye-clean from the top at normal viewing distance?" If they hesitate or cannot say, choose a different stone or move up to VS2 or VS1.
Shown: 0.40 Ct Pear Shape D Color SI1 Lab Grown Diamond
Checking the stone when it arrives
When your diamond or ring arrives, look at it the way other people will see it. Hold it face up about 25 to 30 cm from your eyes, in normal daylight or room light, and turn it slowly. If you cannot see an inclusion without searching, it is eye-clean for practical purposes. Do not judge it under a strong loupe or a phone's zoomed camera, because those reveal details nobody sees in daily life. Compare the stone with its certificate number and plot, and if anything bothers you, use the return window to talk to the jeweler.
Shape Matters: Brilliant Cuts vs Step Cuts
The shape of the diamond has a big effect on how well it hides inclusions.
Brilliant cuts such as round, oval, pear, cushion, radiant, marquise and princess have many small, angled facets. They break up light into lots of sparkle, which makes inclusions much harder to see. These shapes are the best candidates for SI1.
Step cuts such as emerald, asscher and baguette have long, flat, parallel facets and a large open table. They create a "hall of mirrors" effect with broad flashes of light, and that clear, glassy look shows inclusions much more easily. For step cuts, VS1 (or at least VS2) is the safer choice.
| Shape | SI1 suitable? | Recommended minimum |
|---|---|---|
| Round brilliant | Yes, very forgiving | SI1 eye-clean |
| Oval, pear, marquise | Yes; watch the centre and tip | SI1 eye-clean |
| Cushion, radiant, princess | Yes; check corners | SI1 eye-clean |
| Emerald, asscher | Risky | VS2 or VS1 |
| Baguette, step-cut accents | Small sizes usually fine | VS2 for larger stones |
Size Matters Too
The bigger the diamond, the bigger its facets, and the easier it is to see inside it. Inclusions that are invisible in a 0.5 carat SI1 can become visible in a 2 carat SI1 of the same grade.
- Under about 1 carat: Eye-clean SI1 stones are common, especially in brilliant cuts.
- About 1 to 1.5 carats: Many SI1 stones are still eye-clean, but inspect each one carefully.
- Over about 1.5 carats: Consider VS2 or VS1, especially if the stone is a step cut or the setting shows a lot of the stone.
Setting style matters too. A halo or bezel can hide edge inclusions, while a minimal four-prong solitaire shows the whole stone.
Shop the styles in this guide
Durability: Do SI1 Diamonds Break More Easily?
In general, no. Clarity grade alone does not make a diamond weak. Diamond scores 10 on the Mohs scale whatever its clarity. The exception is a large feather (a small internal fracture) that reaches the surface, especially near a point or the girdle. A hard knock in the wrong place could make it worse.
That is why good SI1 selection focuses on the type and position of inclusions. A pinpoint or small crystal does not affect durability. A long surface-reaching feather near a pear or marquise tip is worth avoiding. If in doubt, protect pointed tips with V-prongs.
SI1 or VS1? Match the Grade to Your Situation
There is no single right answer, so here is how the choice usually plays out for different buyers.
- Round or oval solitaire under 1 carat: An eye-clean SI1 is an excellent choice. Put the savings into a better cut or a slightly larger stone.
- Emerald or asscher cut of any size: Go VS1, or VS2 at the minimum. The open table shows too much.
- Stone over about 1.5 carats: Lean toward VS2 or VS1 unless you can inspect a high-quality video of the exact SI1.
- Buying without seeing the stone: VS1 gives more certainty when you cannot check photos or video carefully.
- Halo or cluster settings: SI1 works well, since the halo and accent stones draw the eye and hide edge inclusions.
- Earrings and pendants: SI1 is usually ideal; nobody looks at earrings from 25 cm under a bright light.
- You know you will worry: If the thought of an inclusion will bother you, VS1 is worth it for your peace of mind alone.
Where to Spend Your Budget
For most buyers, cut quality has the biggest impact on beauty, followed by colour. Clarity only matters if you can see the inclusions. That is why an eye-clean SI1 with an excellent cut often looks better than a poorly cut VVS stone.
A practical order of priorities for most brilliant-cut diamonds:
- Cut: Choose the best cut you can. It controls sparkle.
- Carat and size: Decide the face-up size you want.
- Colour: Pick a colour that looks white in your chosen metal.
- Clarity: Go as low as you can while staying eye-clean. For many stones, that is SI1.
With lab grown diamonds, the price gap between grades is smaller than with mined diamonds, so many buyers simply move up to VS1 for peace of mind. Both approaches are sensible; it depends on whether you want maximum size or maximum certainty.
Balancing clarity with colour
Clarity and colour work together. A very white D, E or F colour stone shows the sparkle of a brilliant cut beautifully, and its clean look can make a small, dark inclusion a little easier to notice. A near-colourless G or H stone in yellow gold hides slightly more. If you are choosing between a higher clarity and a higher colour at the same price, most people notice colour more than clarity once both are eye-clean.
Clarity Choices at Ivevar
We offer SI1, VS and VVS lab grown diamonds and help you choose eye-clean stones, set by hand in our Surat workshop in 10K, 14K or 18K gold. Many of our lab diamonds come with IGI certificates, and we can share photos and videos so you can judge the stone yourself, or book a virtual appointment to see it live. Every order ships free worldwide, with 30-day easy returns. Browse pear lab diamonds, round lab diamonds, oval lab diamonds and lab diamond engagement rings.
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Frequently Asked Questions
Is SI1 good for an engagement ring?
Yes, if it is eye-clean. Many beautiful engagement rings use SI1 brilliant-cut diamonds.
Can you see inclusions in SI1?
Sometimes in larger stones or step cuts; many SI1 diamonds, especially brilliant cuts under about 1.5 carats, are eye-clean.
Is VS1 worth the extra cost?
For step cuts and larger stones, often yes. For small brilliant cuts, an eye-clean SI1 usually looks the same.
Which matters more, clarity or cut?
Cut. It has the biggest effect on sparkle, while clarity only matters when inclusions are visible.
Do SI1 diamonds break more easily?
No, unless they have large surface-reaching feathers in vulnerable spots.
What is the difference between VS1 and VS2?
VS2 inclusions are slightly easier to find at 10x than VS1. Both are almost always eye-clean in brilliant cuts.
Are lab grown diamonds graded the same way?
Yes. IGI and GIA use the same clarity scale for lab grown diamonds as for mined diamonds.
Does clarity affect sparkle?
Only in extreme cases. Large clouds or many inclusions can reduce brightness, but an eye-clean SI1 sparkles just like a VS1 of the same cut.
Will anyone notice the difference between SI1 and VS1?
Not if the SI1 is eye-clean. The difference is visible under magnification, not in everyday wear, so friends and family will see the cut, size and sparkle, not the clarity grade.
Is SI1 better than SI2?
Yes. SI1 inclusions are smaller or less noticeable than SI2, so SI1 stones are more likely to be eye-clean.
The Bottom Line
Choose an eye-clean SI1 to save money in brilliant cuts and moderate sizes, or VS1 for extra confidence, step cuts and larger stones. Whatever you choose, prioritise cut quality and judge the actual stone, not only the grade on the certificate.
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Author Bio
Aumsri Pradhan
Founder, Ivevar Luxury
Aumsri Pradhan is the founder of Ivevar Luxury, a Surat-based fine jewelry brand that designs and handcrafts lab grown diamond and moissanite jewelry in its own workshop. She leads the brand's design and customer experience, from engagement rings and bridal sets to custom pieces made to each client's story. Through the Ivevar blog, she shares practical guidance on lab grown diamonds, moissanite, diamond grading and ring design to help buyers choose with confidence.
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