The 4Cs of Diamonds, Explained Simply
Two diamonds of the same size can look — and cost — very different. The difference comes down to the 4Cs: cut, colour, clarity and carat weight. Understanding them helps you choose a diamond you will love, at a price that makes sense.
1. Cut — the sparkle
Cut describes how well a diamond’s facets are shaped and proportioned to return light. A well-cut diamond looks bright and lively; a poorly cut one can look dull even if its other grades are high. If you prioritise one C, many experts suggest it should be cut.
2. Colour — the whiteness
White diamonds are graded on how colourless they are, commonly on a scale from D (colourless) towards Z (light yellow). Grades in the near-colourless range look white to most eyes, especially when set in yellow or rose gold.
3. Clarity — the inner character
Clarity measures natural inclusions and blemishes. Grades run from Flawless through VVS and VS to SI and I. Many inclusions are invisible without magnification, so a VS or good SI stone can look clean to the eye.
4. Carat — the weight
Carat is a measure of weight, not size: one carat is 0.2 grams. Price rises steeply at popular weights such as 0.50 ct and 1.00 ct, so a stone just under these marks can offer better value.
How to balance the 4Cs
- Choose an excellent cut first — it drives the sparkle.
- Pick colour and clarity that look clean to your eye.
- Decide on carat weight last, based on your budget and the design.
- Ask for certification details for qualifying stones.
Want to see the difference for yourself? Book a private viewing and our advisors will show you stones side by side, or browse our diamond jewellery.