Diamond Clarity Chart Explained: What Every Buyer Should Know
Buying a diamond is exciting, but it can also feel overwhelming, especially when you begin hearing terms like clarity grades, inclusion maps, and magnification standards. Among the 4Cs, clarity is often one of the most misunderstood. What does it really mean? How much does it matter? And how do you know what you're actually paying for?
Understanding the diamond clarity chart chart is key to answering those questions. When you know how clarity is graded and how it affects a diamond’s appearance, you can shop with confidence and choose a gemstone that looks beautiful, not just on paper, but in everyday life.
What Is Diamond Clarity?
Diamond clarity refers to the natural characteristics found inside a diamond (inclusions), and on its surface, (blemishes). Inclusions measure internal characteristics of a gemstone such as pinpoints, small crystals, graining, clouds, and feathers. Blemishes include surface characteristics like scratches, abrasions, chips and nicks.
These features form as a diamond grows, either deep within the earth or in a controlled laboratory environment. No two diamonds grow in exactly the same way, which means clarity is part of what makes each gemstone unique. The combination of these inclusions and blemishes impact the overall appearance of the gemstone and its clarity rating.
Clarity does not measure how sparkly a diamond is, that role belongs primarily to diamond cut. But clarity does influence how clean and transparent a diamond appears when light travels through it. Many inclusions are microscopic and invisible to the naked eye, yet they still play an important role in how diamonds are graded, valued, and compared.
Who Created the Clarity Chart?
The modern clarity chart was created by the Gemological Institute of America (GIA) in the mid-20th century under the leadership of gemologist Richard T. Liddicoat Jr. Before this system existed, diamond grading was inconsistent and often subjective, with different sellers using different terminology to describe quality.
GIA introduced a standardized clarity grading scale as part of what would later become the 4Cs: Cut, Color, Clarity, and Carat Weight. The clarity rating was designed to bring objectivity and transparency to diamond grading, allowing the clarity characteristics of diamonds to be evaluated consistently across the global market. Today, the GIA clarity chart is considered the industry gold standard.
How and Why a Clarity Chart Is Used
A clarity chart is more than just a letter grade. It’s a visual map that documents the type, size, and exact location of a diamond’s inclusions and blemishes. Using magnification, gemologists plot these characteristics onto a diagram that corresponds to the diamond’s shape.
The chart serves several important purposes. It explains why a diamond received its clarity grade, acts as a unique identifier for that specific stone, and helps jewelers and buyers understand how inclusions may affect appearance. Two diamonds with the same clarity grade can look very different, and the clarity chart reveals those differences at a glance.
What the Clarity Chart Reveals About a Diamond
The clarity chart tells a deeper story than the clarity grade alone. Inclusions located near the edges of a diamond may be hidden by a setting, while inclusions under the table or near the center can be more visible. The chart also shows whether inclusions are spread out or concentrated in one area, which can influence durability and light performance.
For many buyers, the clarity chart helps determine whether a diamond is eye-clean, meaning inclusions are not visible without magnification, which is often the ideal balance of beauty and value.
Diamond color plays an important role in how included diamonds are perceived. In colorless and near-colorless diamonds, clarity is more visually noticeable because these gemstones are highly transparent. As a result, inclusions, especially dark or centrally located ones tend to stand out more easily. As diamond color decreases, moving from D toward J on the color scale, inclusions become easier to detect, which is why higher clarity grades are often emphasized when selecting colorless diamonds.
Shown are diamond rings graded VS1 with color D, VS1 with color K, and VS1 with color O-P.
What the Diamond Clarity Scale Tells You
The clarity scale is based on how visible a diamond’s inclusions and blemishes are under 10× magnification, and each grade is determined by evaluating five key factors: size, number, location, nature (type), and relief (contrast) of the characteristics.
The GIA grading report allows diamonds to be graded consistently, while still accounting for how inclusions actually affect appearance and performance. The GIA clarity scale includes the following.
FL (Flawless)
No inclusions or blemishes visible under 10× magnification in a flawless diamond. Extremely rare and priced accordingly.
IF (Internally Flawless)
There are no internal inclusions, only minor surface blemishes as seen in the featured IF engagement ring.
VVS1–VVS2 (Very, Very Slightly Included)
VVS diamonds have minute inclusions that are extremely difficult for a trained gemologist to see under magnification. A VVS1 and VVS2 diamond engagement ring are featured.
VS1–VS2 (Very Slightly Included)
VS diamonds have minor inclusions visible under magnification but are typically invisible to the unaided eye. This grade diamond is often considered an excellent balance of beauty and value. While S1& 2 have been a popular choice, the shift to VS clarity rings is growing. Below is a VS1 & VS2 diamond engagement ring.
SI1–SI2 (Slightly Included)
Inclusions are noticeable under magnification (like a jewelers’ loupe) and may be visible without magnification, depending on placement and the diamond shape. Shown are a SI1 and SI2 diamond engagement ring.
I1–I3 (Included)
Inclusions are obvious and may affect transparency, brilliance, or durability. Pictured are an I1, I2 diamond engagement ring.
How Diamond Shape Influences Inclusion Visibility
Diamond shape plays a significant role in how visible inclusions and blemishes are. Brilliant-cut shapes such as round, oval, pear, marquise, and cushion scatter light in a way that helps disguise inclusions, making them more forgiving in lower clarity grades. Shown are VS2 round, oval, and marquise diamond engagement rings.
Step-cut shapes like emerald and Asscher cuts have long, open facets that act like windows into the diamond, making inclusions easier to see. For these shapes, clarity becomes more visually important. Shapes like princess and radiant cuts fall between these extremes, offering sparkle with some openness. Below are a VS2 Asscher cut and emerald cut ring.
This is why clarity charts are especially important as they show how inclusion placement interacts with the diamond’s shape.
Why a GIA Diamond Is More Valuable
GIA-graded diamonds are often more valuable because the grading is widely trusted, consistent, and unbiased. As an independent, nonprofit organization and grader, the Gemological Institute of America does not buy or sell diamonds, which gives buyers confidence that diamond clarity grades are accurate, not inflated.
Because GIA established the modern diamond clarity scale and the 4Cs, its reports are recognized worldwide by jewelers, appraisers, insurers, and resellers. This consistency makes diamonds easier to compare and helps protect long-term value. Simply put, a GIA report removes guesswork, ensuring the diamond you buy is represented honestly. Below are two GIA graded diamond engagement rings.
Lab-Grown Diamonds and the Clarity Chart
Lab-grown diamonds also contain inclusions and blemishes, formed during either HPHT or CVD growth. These diamonds are graded using the same clarity scale and clarity chart standards as natural diamonds, with full disclosure that the stone is laboratory-grown.
Because lab-grown diamonds are often created with fewer inclusions, higher clarity grades are common. Still, the clarity chart remains essential for understanding how those inclusions affect appearance, performance, and long-term wear. Below a lab grown diamond with a VS1-VS2 clarity rating.
Why the Clarity Chart Matters When Buying a Diamond
The clarity chart turns clarity from a technical concept into a practical decision-making tool. It allows buyers to look beyond a single grade and understand how inclusions will affect the diamond’s beauty in real life.
When buying a diamond engagement ring, the clarity chart provides transparency, builds trust, and ensures you’re paying for what truly matters. It empowers you to select a diamond that looks exceptional, not just under magnification, but every day.
Choosing Your Diamond
When it comes to choosing a diamond, clarity charts, grades, and technical details are only part of the story. What truly makes the difference is having a trusted expert who helps you interpret that information and apply it to your priorities.
At E.D. Marshall Jewelers, we go beyond the grading report to help you understand how a diamond will actually look, feel, and wear in real life, not just under magnification. We hand-select diamonds for beauty first, carefully evaluating the diamond cut, clarity of a diamond, and overall performance to ensure each stone is truly eye-clean and well-balanced for its shape.
When choosing a diamond, we take the time to walk you through the clarity chart, explain inclusion placement, and help you find exceptional value without unnecessary upgrades.
Our approach is personal, transparent, and education-driven. We believe buying a diamond should feel exciting and confident, not overwhelming. With expert guidance, trusted grading, and a commitment to quality, we help you choose a diamond you’ll love for a lifetime.