Diamond Color Chart: D to Z Grades Explained

A diamond color chart shows where a white diamond falls on the GIA D to Z scale, where D is colorless and Z has a light yellow or brown tint. Diamonds from D to F are graded colorless, G to J near colorless, and each letter further down the alphabet adds a little more visible warmth. Use the diamond color chart below to understand each range and pick a grade that suits your shape and metal.

The Diamond Color Chart: GIA D to Z Scale

The D to Z scale has 23 letter grades grouped into five ranges, from colorless to light.

The Gemological Institute of America introduced the D to Z system in 1953 to replace inconsistent terms such as "A," "AAA" and "blue white." GIA deliberately started at D so the new grades would not be confused with older systems. The five ranges and GIA's descriptions are:

Grades	Range	GIA description
D, E, F	Colorless	The most chemically pure diamonds in the D to Z range
G, H, I, J	Near colorless	Coloration often unseen except by trained graders
K, L, M	Faint	Coloration still difficult to see by the untrained eye
N to R	Very light	Coloration can be seen in larger stones by the untrained eye
S to Z	Light	Coloration can be seen in many sizes; distinctly yellow or brown, but not enough to be called fancy

GIA notes that many of these distinctions are so subtle they are invisible to the untrained eye, yet they still make a significant difference in quality and price. In general, the less color a white diamond has, the higher its grade.

How Diamond Color Is Graded

Labs grade color by comparing a diamond, viewed table-down, against master stones of known color under controlled lighting.

According to GIA, each diamond is compared with a set of master comparison diamonds, each representing a letter grade. The stones sit table-down in a white, non-reflective grading tray under a daylight-fluorescent light source, with the viewing position controlled. GIA explains that this setup prevents a diamond's brightness and scintillation from interfering with an accurate color assessment.

This is why the letter on the report is a measure of the stone itself, while the way it looks in a ring also depends on its shape, its size and the metal around it. Those factors are covered below.

How Metal Color Affects Perceived Diamond Color

White metals suit colorless and near colorless diamonds best, while yellow gold adds warmth that is most noticeable in stones with a visible tint.

GIA's advice by color range is straightforward:

Diamond color	GIA guidance on metal
D to F	Platinum or white gold is the ideal choice to emphasize a colorless diamond
G to J	Also good candidates for platinum or white gold; if you choose a contrasting metal, keep the prongs white, as yellow gold prongs can impart color
K to L	A middle zone where yellow or white metal can work, depending on the effect you want
M and lower	Likely to show a noticeable yellow tint; yellow gold emphasizes it, while a white band may make the stone appear more colorless

If you love yellow or rose gold but want a colorless center stone, a setting with white gold or platinum prongs is a common way to keep the stone looking icy. Browse yellow gold engagement rings and white gold engagement rings to compare how each metal frames the stone.

Does Diamond Shape Change How Color Looks?

Yes. Step cuts and elongated shapes with points tend to show body color more than round brilliants.

GIA's shape guide says emerald cuts, with their large table and open facets, tend to show color more easily than other shapes, and it suggests G color or better for emerald and asscher cuts. By contrast, GIA notes that the radiant cut's faceting helps mask warm colors.

For pear, marquise and oval diamonds, jewelers commonly observe that color can appear more concentrated toward the pointed ends, especially in narrow or elongated stones. This is a face-up viewing effect, not a change in grade, because the lab grades every shape table-down.

Shape	How color tends to show
Round	Brilliant faceting helps mask body color
Radiant, cushion	Brilliant-style faceting; GIA notes radiant faceting helps mask warm color
Emerald, asscher	Open step facets show color more easily; GIA suggests G or better
Pear, marquise, oval	Color may look more concentrated at the points or ends

Carat weight plays a part too. GIA's own range descriptions note that very light color is easier to see in larger stones. Compare face-up sizes with our diamond size chart and on-hand simulator if you are deciding between a smaller, whiter stone and a larger one.

Fancy Colored Diamonds Use a Different System

Diamonds with more color than Z, and diamonds in hues like pink, blue or green, are graded on GIA's fancy color scale rather than the D to Z diamond color chart.

The D to Z scale measures the absence of color, while the fancy color system measures its presence. GIA describes fancy color using three attributes: hue (the color itself), tone (lightness or darkness) and saturation (strength). These combine into grades such as Fancy Light, Fancy, Fancy Intense, Fancy Vivid, Fancy Deep and Fancy Dark. GIA notes that fancy colors are an exception to the rule that less color means more value.

Lab Grown Diamond Color Grades

IGI grades lab grown diamonds on the same D to Z scale, while GIA has used "premium" and "standard" categories for lab grown diamonds since October 1, 2025.

In July 2025, IGI confirmed it would continue to grade both natural and lab grown diamonds with the full 4Cs. GIA announced in June 2025 that it would stop using its natural-diamond color and clarity terms for lab grown stones, saying more than 95% of lab grown diamonds entering the market fall into a narrow range of color and clarity.

Grown Leo's loose lab grown diamonds are IGI certified and graded D to F color, the colorless range, with VVS1 to VS2 clarity and Excellent cut. To see how color grade and carat weight affect cost, try our lab grown diamond price calculator. For a full walkthrough of all four grading factors, read our 4Cs guide.

How to Choose a Diamond Color Grade

Pick a color grade based on your metal, shape and size, rather than paying for the top of the scale by default.

Start with the metal. For platinum or white gold, GIA points to D to J. In yellow gold, a near colorless or faint stone will pick up some warmth either way.
Consider the shape. Emerald and asscher cuts show color more readily, and pointed shapes can show tint at the ends.
Think about size. Color is easier to notice in larger stones.
Look at the stone face-up. The report grade is taken table-down, so photos or videos of the actual stone show how it will look in wear.

If you are comparing stone types, our lab grown diamond guide explains how lab grown diamonds are made and graded.

Frequently Asked Questions

What is the best color grade for a diamond?

D is the highest color grade on the GIA scale and represents a completely colorless diamond. D, E and F are all in the colorless range, and GIA describes them as the most chemically pure diamonds in the D to Z range. GIA's setting guidance says near colorless G to J diamonds are also good candidates for platinum or white gold, which suits buyers who want a white look for less.

Is there a visible difference between D and F color?

D, E and F are all graded colorless by GIA, and GIA notes that many color distinctions are so subtle they are invisible to the untrained eye. The differences are identified by trained graders comparing stones table-down against master stones under controlled lighting. All three sit at the top of the scale and are typically priced higher than near colorless grades.

Why does the diamond color scale start at D?

GIA introduced the D to Z scale in 1953 to replace inconsistent grading terms such as A, AAA, Roman numerals and "blue white." It deliberately started with D, a letter not associated with top quality in earlier systems, so the new grades would not be confused with the old ones. D represents colorless, and Z represents light yellow or brown.

Does yellow gold make a diamond look more yellow?

Yellow gold can add warmth to a diamond. GIA notes that yellow gold prongs can impart some color to near colorless diamonds, and that yellow gold emphasizes the tint in stones graded M and lower. For D to J diamonds, GIA recommends platinum or white gold settings, or at least white metal prongs, to keep the stone looking colorless.

Which diamond shapes show the most color?

GIA says emerald cuts, with their large table and open step facets, show color more easily than other shapes, and it recommends G color or better for emerald and asscher cuts. Jewelers also commonly observe more visible color at the points of pear, marquise and oval shapes. Round and radiant cuts have faceting that helps mask body color.

Are lab grown diamonds graded on the D to Z color scale?

IGI grades lab grown diamonds on the same D to Z color scale used for natural diamonds and confirmed in July 2025 that it would continue to do so. GIA stopped using D to Z color grades for lab grown diamonds on October 1, 2025, and now assigns a "premium" or "standard" category based on combined color, clarity and finish metrics.

Diamond Color Chart: The D to Z Scale Explained