D vs E vs F Diamond Colour: What Each Grade Means and Which to Choose

What do D, E and F mean in diamond colour?

Diamond colour is one of the four Cs of diamond grading, alongside cut, clarity and carat. For white diamonds, the colour grade measures how little colour a stone has. The GIA scale runs in 23 letters from D (no detectable colour) to Z (a light yellow or brown tint). It starts at D rather than A because older trade systems already used A, AA and AAA loosely, and GIA wanted a clean break.

The letters are grouped into bands. D, E and F are the colourless grades. G to J are near colourless, K to M faint, N to R very light and S to Z light. Our page on how diamond colour is graded from D to Z covers the whole scale; this page zooms in on the top three letters.

• D colour: no detectable colour, even to a trained grader comparing against master stones. See our D colour diamond guide for more on this grade.
• E colour: a minute trace of colour that only an experienced grader can detect face-down. Read what makes an E colour diamond for the detail.
• F colour: a slight trace, still detectable only by a grader under controlled conditions. It is still classed as colourless. Our page on F colour diamonds in detail goes further.

In most natural diamonds, the faint yellow tint comes from nitrogen atoms trapped in the crystal as it grew. The fewer nitrogen atoms, the higher the colour grade. Diamonds with almost no nitrogen are called type IIa; they make up only a small share of natural diamonds but a large share of D colour stones. You may also meet old European trade terms on some older paperwork: River roughly covered D and E, and Top Wesselton roughly F and G.

D vs E vs F diamond colour: can you actually see the difference?

In normal life, almost never. A grader sees the difference between D, E and F by laying the diamond upside down on a white tray, looking through the side of the pavilion (the lower, pointed part) and comparing it with a set of master stones under a daylight-equivalent lamp. That view removes the sparkle and lets the body colour show through the thickest part of the stone.

Once a diamond is set and you look at it face-up (from the top, the way you see it on a hand), the facets send light back to your eye as white light and coloured flashes. That brilliance masks the tiny differences between colourless grades. Side by side on a white card, a trained eye may pick a D from an F. On a finger, in a café, under mixed light, it is not realistic.

What people do notice is the gap between colourless and the lower near-colourless grades in white metal, and the effect of poor cut. A badly proportioned D can look duller and greyer than a well-cut F, because light leaks out instead of coming back through the top.

How are D, E and F colour grades decided?

Colour grading is a comparison, not a measurement on a single instrument. At GIA, graders use a set of master stones: real diamonds of known colour that mark the boundaries between grades. Each grade is a range between two master stones, so one E can sit closer to D and another closer to F. Several graders usually assess the same diamond independently before a grade is issued. If any of these words are new, our plain-English jewellery glossary defines them.

• Position: face-down on a white grading tray, viewed through the pavilion.
• Light: a controlled daylight-equivalent lamp in a neutral grey environment, with no window light.
• Comparison: side by side with master stones, moving the diamond along the set until it fits between two.
• Loose stones only: a mounted diamond can only be given an estimated colour range, because the metal reflects into it.

IGI uses the D to Z letters for both natural and lab-grown diamonds. GIA uses D to Z for natural diamonds, but for lab-grown diamonds it has moved to broader descriptive terms instead of individual letter grades. Some other labs use their own names alongside the letters, so always check which lab issued the report and how its grading conditions are described.

How do D, E and F compare with G and H?

Most buyers comparing D, E and F are also looking one or two grades down. Here is how the top of the scale lines up.

The jump from F to G is the boundary between the colourless and near-colourless bands, and it often carries a noticeable price step for natural diamonds. Yet many people cannot tell an F from G colour, the top of near colourless, once both are set. Further down, H colour diamonds remain a very popular choice in white gold, and I colour, where warmth can start to show in white metal is where the trade-off becomes more personal.

Which metal, shape and size suit a D, E or F diamond?

The setting decides whether you keep the benefit of a colourless grade. Metal reflects into a diamond, so the stone picks up some of its colour.

If you love yellow or rose gold but want the centre to look icy, ask for white claws or a white head on a coloured band. In fully yellow settings, many people choose a grade as low as K colour, with its faint warm tint, because the metal hides the difference.

Shape: round brilliants hide colour best. Fancy shapes such as oval diamonds, pear cut diamonds and radiants tend to show a little more colour at their ends, where the stone is longer; our guide to elongated diamond cuts explains why. Step cuts such as emeralds and Asschers have large open facets that show body colour more clearly. D to F stones look white in every shape, but if you choose a step cut, the case for a colourless grade is a little stronger. To compare every outline, see our overview of the main diamond shapes.

Size: colour is easier to see in bigger stones because light travels further through them. Under about 0.50 carat, the difference between D and G is very hard to see at all. From about 2 carats upwards, colourless grades become more noticeable against near-colourless ones, especially in step cuts.

How much does D vs E vs F diamond colour cost in Australia?

For natural diamonds, each step up the colourless band adds to the price, and the step to D is usually the largest. The diamond looks the same on the hand; you are paying for rarity and the grade on the report. For lab-grown diamonds, the gap between D, E and F is small, because high colours are common in modern lab growth.

These are broad ranges only; prices move with the market and with every other grade, especially cut and fluorescence. If you are weighing whether a D is worth the premium, compare stones that match on everything else. Our page on E colour price and appearance shows where E tends to sit between the two.

Fluorescence also matters most at this end of the scale. Fluorescence is a glow, usually blue, that some diamonds give off under ultraviolet light. GIA describes it as None, Faint, Medium, Strong or Very Strong. In D to F stones, medium to strong blue fluorescence usually sells at a discount, because in rare cases it can make a stone look slightly hazy. Most fluorescent diamonds look completely normal, so it is worth seeing the stone in daylight before ruling one out.

Are lab-grown diamonds usually D, E or F colour?

Many are. Lab-grown diamonds are real diamond, with the same hardness (10 on the Mohs scale) and refractive index (about 2.42) as natural diamond, but they are grown in a laboratory rather than mined. Most CVD (chemical vapour deposition) diamonds are type IIa, with very little nitrogen, so they often reach the colourless grades.

Many lab-grown diamonds are given a post-growth HPHT treatment (high pressure, high temperature) to remove a brownish tint and lift the colour into D to F. This is a standard part of production and the report should say so. Some natural diamonds are treated the same way, which must also be disclosed; GIA laser-inscribes HPHT-processed natural stones it identifies.

Because a lab-grown D costs only a little more than a lab-grown F, more buyers choose D or E in lab-grown than in natural. Natural D to F stones are far rarer, and that rarity is what you are paying for. Neither choice is wrong; they are simply different products, and the report will always state whether a diamond is natural or laboratory-grown.

Is a D colour diamond worth it, or is F the smart pick?

It depends on what you value. A D colour diamond is worth it if knowing the stone sits at the very top of the scale matters to you, if you are choosing a large step cut in platinum, or if you are buying lab-grown, where the D premium is small. If you mainly care about how the ring looks, an F gives the same face-up appearance for less.

• Choose D for a lab-grown stone, a large emerald or Asscher cut in platinum, or when the top grade itself is the point.
• Choose E if you want colourless with a little headroom above F, and an E is priced close to the F you are considering.
• Choose F for the colourless band at a lower natural price. This is why F is often the value point for natural diamonds.
• Look at G if the budget is tight; the face-up difference from F is very small.

How do you choose between D, E and F? Step by step

1. Decide the metal first. If the setting is platinum or white gold, colourless grades keep their look. In yellow or rose gold, consider a lower grade.
2. Set the budget across all four Cs. Read how cut, clarity and carat trade off against colour before you spend on colour alone.
3. Prioritise cut. Choose an excellent or ideal cut before moving up from F to E or D.
4. Check the report. Confirm the lab, the colour grade, the fluorescence, whether the stone is natural or lab-grown, and any treatment such as HPHT.
5. Compare like with like. Look at D, E and F stones with the same carat, clarity and cut, so the price step you see is the colour step.
6. View them face-up and side by side. If you cannot pick the higher grade in daylight, consider comparing an F with a G too.
7. Check fluorescence in daylight. A fluorescent D to F stone may be good value if it looks clear in normal light.