Colour is graded from D (completely colourless) through the alphabet as a faint yellow or brown tint increases. With lab-grown diamonds, top colours are far more affordable than in natural stones, but that doesn't always mean you need them.
What the grades look like
- D–F (colourless): icy white. Differences between D, E and F are invisible to most eyes, even side by side.
- G–H (near colourless): look white once set, especially from the top.
- I–J (near colourless): a hint of warmth may be visible in larger stones or in white metal.
Metal changes everything
- In platinum or white gold, higher colours (D–G) keep the look crisp.
- In yellow or rose gold, the warm metal reflects into the stone, so G–I looks beautiful and is great value.
Shape and size matter
- Brilliant shapes (round, oval, cushion, radiant) hide colour well.
- Step cuts (emerald, Asscher) and very large stones show colour more, so choose a higher grade.
- Small stones (under half a carat) show little colour; G–H is usually plenty.
Lab-grown specifics
Some lab-grown stones can show a faint grey or brown tint rather than yellow, and some HPHT stones a slight blue tint. The grade on the report captures this, but a video in daylight helps you judge.
Our recommendation
- Engagement ring in white metal: E–G
- Engagement ring in yellow or rose gold: G–H
- Studs and pendants: G–H
- Melee: matched EFG or GH
Put the savings into cut quality and size. Learn more in our 4Cs guide or ask us.
