When you’re choosing a diamond for an engagement ring, clarity is one of the first grades you’ll encounter, and one of the easiest to misunderstand. A diamond clarity chart explained properly can save you from overspending on a grade difference you’d never actually see with the naked eye, or worse, underspending on a stone where inclusions are plainly visible.

Clarity refers to the tiny natural imperfections found inside (and sometimes on the surface of) a diamond. Every stone is graded on a scale from Flawless to Included, and where a diamond sits on that scale directly affects its price and visual appeal. But here’s what most guides won’t tell you: the "best" clarity grade isn’t always the right one for your ring. Context matters, your setting style, diamond shape, and budget all play a role.

At A Star Diamonds, our gemologists in Hatton Garden walk clients through these decisions daily, helping them find stones that look exceptional without paying for grades they don’t need. In this guide, we’ll break down every clarity grade on the scale, explain what inclusions actually are, and show you how each level affects value, so you can shop with real confidence.

Why diamond clarity matters for sparkle and value

Clarity affects a diamond in two distinct ways: how it looks and what it costs. Inclusions are natural features formed deep within the earth as a diamond grows under intense pressure. When they’re large or positioned near the centre of a stone, they can interrupt the path of light through the diamond, reducing its brilliance. When they’re small and positioned near the edge, you’d never see them, even if you looked closely under normal lighting conditions.

How inclusions affect light performance

A diamond’s brilliance comes from light entering the stone, bouncing off internal facets, and returning to your eye. Inclusions that sit directly under the table (the large flat top facet) can block or scatter that light path in a way that dulls the stone’s appearance. A crystal inclusion, for example, can act like a small obstacle that prevents light from reflecting cleanly back through the crown. Feather inclusions (tiny internal fractures) are particularly worth understanding, because larger ones can affect both the visual performance and long-term durability of the stone.

The position of an inclusion matters just as much as its size. A small inclusion sitting under the table can be more visible than a larger one tucked near the girdle edge.

Why clarity grade directly drives price

When you work through a diamond clarity chart explained properly, you’ll quickly see that each step up the scale carries a significant price increase, often between 10 and 20% per grade. A Flawless diamond commands a steep premium over a Very Slightly Included stone, yet in a well-cut round brilliant, those two diamonds can appear virtually identical to the naked eye. Understanding this relationship helps you allocate your budget more effectively, directing funds toward factors like cut quality that have a far greater impact on how your diamond actually looks in the ring.

The GIA diamond clarity chart and what each grade means

The GIA (Gemological Institute of America) developed the clarity grading system used across the industry today. When you look at a diamond clarity chart explained by the GIA, you’ll find 11 grades arranged across six categories, ranging from Flawless at the top to Included at the bottom.

A higher clarity grade does not automatically make a diamond look better. It simply means fewer or less visible inclusions under 10x magnification.

The clarity grades from top to bottom

Understanding each grade helps you make a smarter purchase decision. Here’s a breakdown of every category on the GIA clarity scale:

FL and IF diamonds are extremely rare and carry a steep price premium. For most buyers, VS1 through SI2 represents the practical range where visual beauty and realistic value genuinely intersect.

Common inclusions and blemishes and how they affect a diamond

Not all inclusions and blemishes behave the same way. A diamond clarity chart explained without naming specific flaws leaves you guessing, so it pays to know exactly what graders are looking for inside and on the surface of a stone.

Internal inclusions

Crystals are tiny mineral deposits trapped inside the diamond during growth. Large crystals sitting under the table facet can disrupt light return, while small ones near the edge have almost no visual impact. Feathers are internal fractures that appear white or transparent; larger feathers can reduce both brilliance and structural strength over time. Clouds, clusters of micro-inclusions, can give a diamond a milky or hazy look and are worth scrutinising closely before you commit.

If a grading report lists "cloud" without specifying size, always ask your jeweller to show you the stone under magnification before you buy.

Surface blemishes

Scratches and naturals sit on the outer surface of a diamond rather than inside it. Minor scratches are usually superficial and can often be polished away, while naturals are remnants of the original rough diamond left along the girdle.

Surface blemishes carry less weight in clarity grading than internal inclusions, and once a stone is set in a ring, they’re rarely visible at all.

How to choose the right clarity for your budget

Choosing the right clarity grade starts with understanding that eye-cleanliness matters more than grade. An eye-clean diamond is one where no inclusions are visible to the naked eye at arm’s length. Once you grasp this, using a diamond clarity chart explained properly becomes far more practical, because you can focus on grades that deliver a beautiful stone without paying for microscopic perfection.

Match clarity to your diamond shape

Your diamond’s shape plays a direct role in how visible inclusions appear. Round brilliant cuts use their 57 facets to scatter light intensely, which masks inclusions far better than other shapes. Step-cut stones like emerald and Asscher cuts have large open facets that act like windows, making inclusions considerably easier to spot. For step-cuts, aim for VS1 or higher. For round brilliants, an SI1 or even SI2 can look completely clean in everyday wear.

Always view a stone in person or via high-resolution video before committing, particularly if you are considering an SI grade in a step-cut shape.

The sweet spots on the clarity scale

VS2 and SI1 represent the strongest balance of quality and value for most buyers. Budget-conscious shoppers can often find eye-clean SI2 round brilliants at a considerably lower price than a VS stone, with no visible difference once the diamond sits in a finished ring setting.

How to check clarity in real life and on a certificate

A diamond clarity chart explained on paper only takes you so far. To make a confident purchase, you need to know how to verify clarity both through the grading certificate and by examining the stone directly, because the two methods tell you different things.

Reading a grading certificate

Your grading report, ideally from the GIA or AGS, includes a clarity grade alongside a plot diagram that maps every inclusion’s type and location within the stone. Check where inclusions sit relative to the table facet, as central positions are more likely to be visible. If a cloud inclusion appears on the plot without a size descriptor, ask your jeweller for clarification before proceeding.

A grading certificate confirms what a gemologist found under 10x magnification, not necessarily what you will see with your own eyes in everyday conditions.

Viewing a diamond in person

Always examine a stone face-up and unmagnified first, mimicking how you will actually see it once it is worn. Hold it at arm’s length under natural daylight or a neutral light source. If you cannot visit in person, request a high-resolution video taken under consistent lighting so you can assess how the stone performs before committing.

Next steps for choosing your diamond

Now that you have a diamond clarity chart explained from grade to grade, you can approach your purchase with far more confidence. The most useful next step is to narrow your preferred clarity range based on your chosen shape and budget, then view actual stones within that range rather than comparing grades on paper alone.

Clarity is only one part of your decision. Cut quality and carat weight both deserve equal attention, and the right balance across all four Cs is what produces a diamond that genuinely looks exceptional on the hand. Work with a jeweller who can show you stones side by side and explain exactly what you are seeing.

At A Star Diamonds, our gemologists guide you through every stage of this process, from choosing your clarity grade to designing the finished ring. Book a consultation with our Hatton Garden team and find the diamond that reflects your story.