The Four Cs of Diamonds: Cut, Colour, Clarity & Carat Explained

When choosing a diamond, you’ll often hear jewellers refer to the “Four Cs”. These are the global standard used to assess a diamond’s quality: Cut, Colour, Clarity and Carat.

Understanding the Four Cs will help you choose a diamond that not only looks beautiful, but feels right for your style and budget.

At Wrights Jewellers, we believe in helping you choose a diamond with confidence—one that will be treasured for a lifetime.

1. Cut: The Most Important of the Four Cs

Of all the Four Cs, cut has the greatest impact on a diamond’s beauty.

Cut refers not to the shape of the diamond, but how well it has been proportioned and polished to reflect light. A well-cut diamond will sparkle brilliantly, while a poorly cut diamond can appear dull even if it has excellent colour and clarity.

Cut grades typically range from Excellent to Poor.

In simple terms: Cut determines how much your diamond sparkles.

2. Colour: How White a Diamond Appears

Diamond colour actually refers to the absence of colour. The less colour present, the rarer and more valuable the diamond.

Colour grades run from D (colourless) through to Z (light yellow or brown tones).

Most diamonds used in fine jewellery sit in the near-colourless range, where any warmth is often very subtle once set in jewellery.

In simple terms: Colour affects how white or warm your diamond looks.

3. Clarity: Natural Characteristics Within the Diamond

Clarity refers to the natural inclusions and tiny internal characteristics found within most diamonds. These are formed during the diamond’s creation deep within the earth.

Most inclusions are not visible to the naked eye and do not affect a diamond’s beauty.

Clarity grades range from Flawless (extremely rare) to Included.

In simple terms: Clarity measures how “clean” a diamond is.

4. Carat: Diamond Size and Weight

Carat refers to the weight of the diamond, not its physical size. One carat is equal to 200 milligrams.

While carat influences how large a diamond appears, it is only one part of the overall beauty equation. Two diamonds of the same carat weight can look very different depending on cut quality and shape.

In simple terms: Carat is how big your diamond is.

How the Four Cs Work Together

The Four Cs should never be considered in isolation. A slightly lower colour or clarity grade can still produce a stunning diamond if the cut is excellent.

In fact, many people choose to prioritise cut above all else, then balance colour, clarity and carat based on personal preference and budget.

Choosing the Right Diamond for You

There is no single “perfect” combination of the Four Cs—only the one that best suits you.

Some prefer a larger diamond with subtle warmth, while others prioritise maximum sparkle in a slightly smaller stone.

At Wrights Jewellers, we help you find the balance that feels right, ensuring your diamond is both beautiful and meaningful.

Explore Diamonds at Wrights Jewellers

Whether you’re just beginning your search or ready to choose your diamond, our team can guide you through the Four Cs in person and help you find a stone you truly love.

We’re here to help you understand your options, source exceptional diamonds, and create a piece of jewellery that will be treasured for generations.

Bespoke Diamond Jewellery

At Wrights Jewellers, we don’t just help you choose a diamond—we can help you create something completely unique.

We can source diamonds specifically to your preferences, whether you’re looking for a particular carat weight, cut quality, shape, or budget. This allows us to present carefully selected options that match exactly what you’re looking for, rather than overwhelming you with endless choices.

Whether you're imagining something entirely new or looking to breathe new life into a beloved piece, our bespoke and remodelling service is an invitation to create something truly personal. Every piece is crafted by hand, designed to last a lifetime — and beyond.

If you'd like to begin the process, you can book an appointment with our team to discuss your ideas in person.

You can learn more about our bespoke jewellery process here.