The 4Cs of a Diamond — Without the Jargon

Cut is not the same thing as shape.

Round, oval, pear and emerald are shapes. Cut describes how well a diamond's proportions and facets work together with light.

It's what creates brightness, fire and sparkle.

A beautifully cut diamond can look lively and brilliant. A poorly cut diamond may look dull even if it scores impressively in other areas.

For standard round brilliant diamonds, GIA grades cut from Excellent to Poor.

In everyday terms?

Don't look at the certificate alone. Look at the diamond.

When we talk about colour in a traditional white diamond, we're usually talking about how little colour it has.

The GIA D-to-Z scale begins at D — colourless — and gradually moves towards diamonds showing more yellow or brown.

But here's where choosing a diamond becomes more interesting than simply chasing the highest grade.

Very small differences between neighbouring colour grades can be difficult to see without controlled comparison, and the metal surrounding the stone also affects how you perceive it.

A diamond doesn't live on a grading report. It lives in a piece of jewellery.

Most diamonds have tiny internal or surface characteristics.

Internal characteristics are called inclusions. Surface characteristics are called blemishes.

GIA clarity grading is performed at 10× magnification and considers things such as the size, nature, position, relief and number of clarity characteristics.

The scale runs from Flawless (FL) through IF, VVS, VS and SI to Included grades.

That sounds terribly technical.

What matters to most people is much simpler:

Can you see anything without magnification?

Does it affect the beauty of the stone?

Could a particular inclusion affect durability?

And are you paying more for a difference you'll never actually see?

That's where informed selection matters.

Carat is a measure of weight — not simply how large a diamond looks.

One carat equals 0.20 grams and is divided into 100 points.

Two diamonds of exactly the same carat weight can look different in size because their proportions and shapes distribute that weight differently.

So when somebody says, "I want a one-carat diamond", that's useful information — but it isn't the whole conversation.

There isn't one universally perfect combination of the 4Cs.

One person may care enormously about size. Another may prefer exceptional cut and sparkle. Someone else may choose a slightly warmer stone because they love it in yellow gold.

The clever part is understanding where the differences matter to you — and where you're simply paying for something on paper.

If you'd like help comparing stones, talk to us. We'll happily show you what those grades actually look like in the real world.