E Colour Diamond Guide: What It Means, How It Looks and What It Costs

What is an E colour diamond?

An E colour diamond sits second from the top of the GIA D-to-Z colour scale, which runs from D (completely colourless) down to Z (a light yellow or brown tint). Colour is one of the four Cs of diamond grading, alongside cut, clarity and carat weight. E belongs to the colourless band with D and F. Grades G to J are called near colourless, K to M faint, and the tint becomes steadily easier to see from there down.

What separates E from D is a trace of colour so slight that a trained grader can only find it by turning the diamond upside down, looking through the pavilion (the pointed underside), and comparing it with reference diamonds called master stones under controlled daylight-balanced lighting. Set in a ring and seen face-up, E and D look the same to nearly everyone. Our explainer on how diamond colour grading works covers the full scale and the lighting labs use.

In most natural diamonds, the faint yellow comes from nitrogen atoms trapped in the crystal as it formed, which absorb a little blue light. The less nitrogen, the whiter the stone. A good share of colourless diamonds are Type IIa, meaning they contain almost no nitrogen at all; this is a scientific classification, not a quality grade, and an E can be either Type Ia or IIa.

The grades either side are worth knowing too. Our page on D colour, the top of the scale explains what the extra step buys, and F colour diamonds, the lowest colourless grade covers the step down. Any unfamiliar term on this page is defined in our jewellery terms explained in plain English.

How does an E colour diamond look compared with D and F?

Face-up, the way you see a diamond on the hand, the differences between neighbouring colourless grades are tiny. Most people need a gap of two or three grades, viewed side by side in neutral light, before they can reliably say which stone is warmer. Here is how E compares with the grades around it:

So the honest answer is that an E colour diamond is chosen for what you know about it, and for how white it stays in demanding conditions such as large step cuts, rather than for a difference you will see across a dinner table. The jump that people do start to notice is from E to the lower near-colourless grades; see what a G colour diamond looks like and how H colour compares in a ring for where warmth begins to appear.

Cut quality also changes the picture. A well-cut round returns so much white light that it masks body colour, while a poorly cut stone can look duller or greyer than a better-cut diamond two grades lower. For a full side-by-side of the top three, read our D, E and F colour comparison.

How do labs grade E colour, and does fluorescence matter?

At GIA, IGI and similar labs, colour is graded on the loose diamond. The stone is placed face-down on a white tray, beside a set of master stones whose grades are known, under standardised lighting. The grader judges which master stones the diamond falls between. A diamond graded E has less colour than the F master and at least as much as the E master. Because it is a comparison by eye, two experienced graders can occasionally disagree by a grade at the borders, which is one reason to buy only with an independent report.

Fluorescence is the glow some diamonds give off under ultraviolet light, usually blue. Reports describe it as None, Faint, Medium, Strong or Very Strong. In lower colours, blue fluorescence can make a stone look a touch whiter in daylight. In high colours like E there is no warmth to offset, and in a small number of stones strong fluorescence can give a slightly hazy or oily look. For that reason, natural E stones with Medium to Strong fluorescence often sell for somewhat less than otherwise similar stones with none.

• None or Faint: the usual choice in E; no effect on appearance.
• Medium: rarely visible; often priced a little lower.
• Strong or Very Strong: view the actual stone or a daylight video first to rule out haziness.

Does diamond shape change how E colour looks?

Yes. The shape and facet style decide how much body colour reaches your eye. Brilliant-cut rounds hide colour best, because their facets break light into lots of bright flashes. Fancy shapes hold more depth at their ends and corners, where colour collects.

Step cuts such as the emerald and Asscher show colour more than any other shape because their long, flat facets act like windows rather than mirrors. Size matters too: a 0.50 carat round shows very little body colour, while a 3 carat emerald cut shows it clearly. For the pairing we suggest in each shape, see our colour and clarity pairings for every shape.

Which ring metal suits an E colour diamond?

The metal around a diamond reflects into it. Platinum and rhodium-plated white gold are neutral and cool, so they let an E colour stone look exactly as white as it is graded. That is where E makes the most visual sense.

• Platinum: naturally white and dense; it pairs cleanly with D–F stones and does not need replating.
• White gold: usually rhodium-plated for a bright white finish; replating every year or two keeps it from drifting warmer.
• Yellow gold: reflects warm light into the stone, so much of E's whiteness is lost. Many people choose a lower grade here.
• Rose gold: similar to yellow; an E diamond picks up a soft pink-warm glow from the claws.

In yellow or rose gold, the practical difference between E and a lower grade shrinks a lot. Many buyers find an I colour diamond in yellow gold or even J colour stones set in warm metals look white against the metal. A popular compromise is a yellow gold band with white gold or platinum claws, which keeps the stone sitting in white metal. Our guide to how ring metal changes diamond colour shows this grade by grade.

How much does an E colour diamond cost in Australia?

Colour has a strong effect on natural diamond prices at the top of the scale, because higher grades are rarer. The step from E up to D is usually larger than the step from E down to F, and the gaps widen as carat weight rises. These broad ranges are for a 1 carat round brilliant with VS2 clarity and an Excellent cut grade:

These are approximate ranges only; prices move with the market and with the exact cut, clarity, fluorescence and report. As a pattern in natural diamonds, an E typically costs noticeably less than an otherwise identical D and a little more than an F, which is why many people see it as the sweet spot within the colourless band. In lab-grown diamonds the steps between colourless grades are much smaller in dollar terms, because the whole price level is far lower.

If you are weighing up whether to come down from the colourless band altogether, our guide to choosing between G and H for an engagement ring sets out what you see and what changes in price.

E colour lab-grown vs natural: what is different?

Both are real diamond, with the same hardness (10 on the Mohs scale), the same refractive index of about 2.42, and labs such as IGI grade lab-grown colour on the same D-to-Z letter scale (GIA now uses broader descriptive terms for lab-grown instead of letter grades). Side by side, an E natural and an E laboratory-grown diamond look identical to the eye. The differences are in origin, rarity and price.

• Natural E: formed deep in the earth roughly 1 to 3.5 billion years ago. Colourless natural stones are a small share of mined production, which is why E commands a clear premium over near-colourless grades.
• Lab-grown E: grown in a laboratory by CVD (chemical vapour deposition) or HPHT (high pressure, high temperature). Many lab-grown diamonds come out in the D–F range, so E is common rather than rare.
• Treatment: many CVD lab-grown diamonds receive a post-growth HPHT treatment to improve colour. A reputable report states this; some describe the stone as 'as grown' if it has not been treated.
• Reports: lab-grown E stones are most often graded by IGI. Check the report clearly says lab-grown, and check the inscription on the girdle matches.

Because lab-grown E stones cost a small fraction of natural E stones, the decision about colour becomes easier: the extra dollars for E over G in lab-grown are often modest. With natural diamonds, the same step can be thousands of dollars at 1.5 carats and above. Neither natural nor lab-grown diamonds should be bought expecting to resell them for more.

Is an E colour diamond worth it? When it is the smart pick

E is worth paying for when its whiteness will actually show, or when the price gap is small enough not to matter. It tends to be the smart pick in these situations:

• Platinum or white gold settings, where nothing warms the stone.
• Step cuts and large fancy shapes, especially emerald, Asscher and ovals over about 1.5 carats.
• Larger stones, from about 2 carats, where body colour becomes easier to see.
• Lab-grown diamonds, where the premium for E over lower grades is often small.
• Matching side stones or a halo of high-colour melee (tiny accent diamonds), so the centre does not look warmer than its surround.
• Buyers who want a top-tier grade without paying the extra premium for D, knowing the two look the same face-up.

E is harder to justify in yellow or rose gold, in small round stones under about 0.70 carat, or when the budget is tight and the extra money would buy a better cut or a cleaner clarity. Our guide to deciding between colour and clarity helps you weigh that trade-off.

For perspective on the far end of the scale, K colour, where a faint warmth becomes visible and L and M faint yellow diamonds show how far colour can drop while still suiting a vintage-style or yellow gold ring. Some people deliberately choose those warmer grades for character, which is a valid choice too.

How do you choose an E colour diamond? Step by step

1. Confirm the report. Check it is from an independent lab such as GIA or IGI, lists colour as E, and states whether the diamond is natural or lab-grown and whether it has been treated.
2. Check fluorescence. None or Faint is simplest; if it is Strong, view a daylight video to rule out haziness.
3. Prioritise cut. An E with a mediocre cut will look less bright than a well-cut F or G. Aim for Excellent or Ideal in rounds and strong symmetry in fancy shapes.
4. Match the metal. Choose platinum or white gold claws to get the full benefit of the grade.
5. Compare against F and D. Look at the price for the same stone one grade either side and decide whether the step is worth it to you.
6. View it in neutral light. Look at the stone or video in daylight rather than under showroom spotlights, which make every grade look whiter.