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How to choose an engagement ring: the 4Cs

Cut, colour, clarity and carat, explained simply, and where it pays to spend.

Guide
Emerald-cut diamond ring in yellow gold with a pavé band

Every diamond is graded on four qualities, known as the 4Cs. Understanding them helps you compare stones fairly and spend where it shows.

Cut

Cut decides how a diamond returns light. It matters more to sparkle than anything else, so choose Excellent or Very Good and save elsewhere if you need to.

Colour

Graded from D (colourless) down the alphabet. Set in white gold, D to G look icy white; in yellow or rose gold, H or I look just as bright and cost less.

Clarity

How many tiny inclusions a stone has. From VS2 upwards they cannot be seen without magnification, so a flawless grade is rarely worth the premium.

Carat

Carat is weight, not size. Prices jump at round numbers, so a 0.90 ct diamond can look like a 1.00 ct for noticeably less.

Ask to see the GIA report for every stone you consider, and compare two or three side by side.
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