Diamond Clarity Chart: A Practical Guide to Diamond Clarity Grades

A diamond clarity chart shows how gemological laboratories classify the internal inclusions and external blemishes that affect a diamond’s appearance. A diamond clarity chart makes it easier to compare grades and visible inclusions. The GIA scale runs from Flawless to Included, but a clarity grade is not a price tag or a complete description of the stone. Learning how to read the grade, plot, and report can help you ask better questions before buying or selling a diamond.

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What Is a Diamond Clarity Chart?

A diamond clarity chart is a visual reference for the GIA clarity scale, which has six categories and 11 individual grades. It helps readers compare terms such as Flawless, Very Very Slightly Included, Very Slightly Included, Slightly Included, and Included. The chart is a starting point for understanding a report, not a substitute for examining the actual diamond.

Clarity describes characteristics inside or on the surface of a diamond. Internal characteristics are called inclusions, while surface characteristics are called blemishes. A grader considers their size, number, position, relief, and nature under 10x magnification. The same grade can look different from one diamond to another because the type and location of its characteristics matter.

For the laboratory definitions behind the scale, see the Gemological Institute of America diamond clarity guide. GIA explains that many inclusions and blemishes are not visible without magnification, which is why a chart should be read alongside the grading report and the stone itself.

How Does the GIA Diamond Clarity Scale Work?

The GIA Diamond Clarity Scale ranks diamonds from FL, with no inclusions or blemishes visible to a skilled grader under the grading conditions, through I3, where inclusions are obvious under 10x magnification and may be visible without it. The scale uses consistent terminology so buyers, sellers, and professionals can discuss clarity using a shared reference.

Clarity category	Grades	What the category communicates
Flawless	FL	No inclusions or blemishes visible to a skilled grader under 10x magnification.
Internally Flawless	IF	No inclusions visible under 10x magnification, although surface blemishes may be present.
Very Very Slightly Included	VVS1, VVS2	Inclusions are difficult for a skilled grader to see under 10x magnification.
Very Slightly Included	VS1, VS2	Inclusions range from difficult to somewhat easy for a skilled grader to see under 10x magnification.
Slightly Included	SI1, SI2	Inclusions are noticeable to a skilled grader under 10x magnification and may or may not be visible without magnification.
Included	I1, I2, I3	Inclusions are obvious under 10x magnification and may affect transparency, brilliance, or durability.

The chart is useful because it shows the order of the grades, but the labels should not be treated as interchangeable. A VS1 and a VS2 can have different inclusion types and locations. A diamond’s face-up appearance depends on its cut, shape, size, lighting, and the contrast and position of the inclusions, not only the letters and number on the report.

What is the difference between FL and IF?

FL means a skilled grader sees no inclusions or blemishes under 10x magnification. IF means no inclusions are visible, but surface blemishes may be present. Both sit at the top of the GIA clarity chart. The distinction is a grading description, not a guarantee that one stone will look more attractive in every setting or lighting condition.

What Are Inclusions and Blemishes?

Inclusions are internal characteristics, and blemishes are external characteristics on a diamond’s surface. A clarity chart summarizes their effect on a grade, while the grading report’s plot shows where they appear. That location can matter because a small characteristic near the edge may be less noticeable face-up than a darker characteristic below the table.

• Crystals and pinpoints: Small mineral or crystal features inside the diamond.
• Clouds: Groups of tiny pinpoints that can appear together.
• Feathers: Internal fractures that should be considered in relation to their location and surface reach.
• Needles: Long, thin inclusions that may be difficult to see without magnification.
• Polish lines and naturals: Surface features that can affect the blemish portion of a report.

Not every inclusion is a defect that a viewer can see. Some are only visible under magnification, while others can influence transparency, brilliance, or durability. The important question is not simply whether a report contains a plotted symbol. It is what the characteristic is, where it is located, how visible it is, and how it affects the individual stone.

How Should You Read a Diamond Clarity Chart and Grading Report?

Read a diamond clarity chart as a map to the report, then use the report to connect the grade to the specific stone. Start with the report’s identity information, confirm the clarity grade, review the plot and comments, and examine the diamond under appropriate lighting. A chart cannot confirm that a particular stone matches its paperwork.

1. Confirm the report identity: Match the report number, shape, measurements, and carat weight to the diamond you are viewing.
2. Find the clarity grade: Locate the grade in the 4Cs section and compare it with the scale above. Do not confuse clarity with color, cut, or carat weight.
3. Study the clarity plot: Use the plot and legend to identify the characteristics shown and their approximate positions. Red and green symbols may distinguish internal characteristics from surface features depending on the report format.
4. Read the comments: Comments can add context that a grade alone cannot provide. Pay attention to any statement about characteristics, treatment, or features that are not plotted.
5. Look at the diamond itself: Compare the report with the face-up appearance under more than one lighting condition. Magnification and unaided viewing answer different questions.

Diamond Banc’s guide to understanding diamond grading reports can help with the wider report-reading process. If a document is missing, unclear, or does not match the stone, ask a qualified professional to explain what can be verified before relying on the grade.

Which Diamond Clarity Grade Looks Best to the Naked Eye?

There is no single clarity grade that looks best to every person or works best for every diamond. A stone can appear clean to the unaided eye even when its report contains inclusions, while a higher-grade stone can still show a visible characteristic because of its size, color, position, or the diamond’s shape and cut. Eye-clean is a viewing description, not a GIA grade.

Size changes how easy a characteristic is to see because larger stones present a larger viewing area. Shape changes the way facets reflect light and may make certain characteristics more or less noticeable. Cut quality affects brilliance and contrast, which can also change the way the eye perceives clarity. This is why two diamonds with the same VS2 or SI1 grade should not be assumed to look identical.

If you are comparing stones, view them side by side when possible. Ask which characteristics can be seen without magnification, whether any appear dark or reflective, and whether the setting will hide or emphasize them. A practical chart helps you understand the terminology, but your decision should account for the actual diamond and your priorities.

How Does Clarity Affect Diamond Value and Resale?

Clarity can influence diamond value and resale, but a clarity grade alone cannot determine an offer. A professional evaluation may also consider cut, color, carat weight, shape, fluorescence, polish, symmetry, documentation, condition, market demand, and the setting or jewelry design. The relationship is not a simple ladder where every one-grade difference produces a fixed dollar change.

Clarity has the greatest practical significance when it changes the way a diamond looks, when a report raises a durability or transparency question, or when buyers in a particular market prefer a certain combination of 4Cs. A higher grade can be meaningful for rarity, but a lower grade may still be attractive if its inclusions are difficult to see and the rest of the stone is strong. Conversely, a nominally favorable grade does not remove the need to inspect the plot and the actual diamond.

For a broader explanation of valuation factors, read Diamond Banc’s guide to diamond clarity characteristics beyond the 4Cs. For a valuation path, use the Diamond Banc diamond calculator guide. Neither a chart nor an online estimate replaces a review of the specific stone and its documentation.

Diamond clarity chart takeaway: read the grade, inspect the plot, and separate visual appearance from resale assumptions.

What Should Sellers Ask During a Diamond Evaluation?

A clear evaluation should explain how the diamond’s documentation, physical characteristics, and current market context were considered. Sellers do not need to memorize every symbol on a report, but they should leave with a better understanding of what the evaluator saw and which facts influenced the discussion.

• Does the report number match the diamond being examined?
• Which inclusions or blemishes are most important on this particular stone?
• Can any characteristics be seen without magnification or in normal jewelry lighting?
• Does the clarity plot raise a question about transparency, brilliance, or durability?
• How does the clarity information fit with the cut, color, carat weight, shape, condition, and current demand?
• What additional documentation or testing would help confirm the evaluation?

These questions keep the conversation focused on evidence instead of a generic grade comparison. If you are selling, bring the original report, purchase records if available, and any information about the setting or previous service. A buyer should also explain what happens after the review and what options you have if you decide not to accept an offer.

Diamond Banc’s diamond appraisal and certification guide provides additional context for preparing documentation and understanding professional review. The right next step depends on whether you want an outright sale, a valuation conversation, or another liquidity option.

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Frequently Asked Questions About Diamond Clarity

Which clarity of diamond is best?

The best clarity depends on the individual diamond and your priorities. FL and IF are the highest GIA clarity categories, but many buyers compare appearance, cut, color, carat, shape, documentation, and budget together. A lower grade may look clean without magnification, while a higher grade is not automatically the most attractive stone in every setting. Compare the actual diamond, not only the label on a chart.

Is VS1 or VS2 a better diamond?

VS1 is a higher GIA clarity grade than VS2, but the better choice depends on the specific inclusions and how the diamond looks. A VS2 with a well-positioned, difficult-to-see characteristic may be more appealing to a buyer than a VS1 with a more noticeable feature. Review the plot and inspect the stone instead of assuming that the grade alone settles the comparison.

Are SI diamonds eye-clean?

Some SI diamonds may appear clean to the unaided eye, while others may show inclusions. Visibility depends on the stone’s size, shape, cut, lighting, and the type and location of its characteristics. Eye-clean is not a formal GIA grade, so ask to view the actual diamond under normal lighting and discuss any visible features before making a decision.

Does diamond clarity affect resale value?

Diamond clarity can affect resale value, but it is only one part of an evaluation. Cut, color, carat weight, shape, fluorescence, polish, symmetry, documentation, condition, setting, and current market demand can also matter. A chart cannot provide a guaranteed resale price. A professional review should connect the clarity grade and plot to the individual diamond and the market context.

How many grades are on the GIA diamond clarity chart?

The GIA Diamond Clarity Scale has 11 grades in six categories: FL, IF, VVS1, VVS2, VS1, VS2, SI1, SI2, I1, I2, and I3. The categories run from Flawless to Included. Each grade describes what a skilled grader sees under the standard grading conditions, while the report and the diamond itself provide the detail needed for a closer evaluation.

Key Takeaway

A diamond clarity chart makes grading language easier to understand, but it is only the first step. Use the chart to orient yourself, then compare the report with the actual diamond, ask about the characteristics that matter most, and keep clarity in context with the rest of the 4Cs and current market factors.