What Color Is Onyx?

The short answer

As a color name, onyx usually means a very dark, near-black shade. It typically reads as black with a slight softness or gray cast rather than the deepest possible black. The name comes from onyx the stone, a banded variety of chalcedony, which is a form of quartz. The stone occurs in more than one color, and its banding often alternates dark and light layers. Black onyx is the version most people picture, which is why the color name leans toward black.

Onyx has no single universal definition. Paint makers, fashion and product brands, software palettes and design systems each assign their own value to it. The material behind this article contains no standardized hex, RGB, CMYK or spot-color value for onyx, so treat the word as a description rather than a specification.

How onyx differs from pure black

Most palettes present onyx as a step away from absolute black. It is slightly lifted and may lean cool, warm or neutral depending on who defined it. The difference matters most when onyx sits beside pure black or on a dark background. There, a small shift can look like deliberate depth or like a mismatch. The name alone cannot tell you a given onyx's undertone, so check the source palette's actual values.

Using onyx in a logo color palette

In logo work, a color name only becomes useful once it is tied to exact values. If a brand palette includes onyx, record it precisely for each output: hex or RGB for screens, CMYK for process printing, and a spot-color reference if the brand uses spot inks. Without those values, two designers working from the same word can produce visibly different blacks.

• Define one master onyx value, derive the screen and print values from it, and document all of them in the brand guidelines.
• Test the color at small sizes and on both light and dark backgrounds, because near-black shades can lose separation from dark surfaces.
• For print, decide whether onyx should be a single-ink black or a rich black built from several inks, and confirm the choice with the printer, since ink limits and paper stock affect the result.
• Pair onyx with at least one light neutral or accent so the mark keeps contrast and has a workable reversed version.
• Name the swatch consistently in the source file so the value can be found and updated globally.

Checking what onyx means inside a vector logo file

In a vector logo, color is stored in the fill and stroke properties of paths and live text, often linked to named swatches. To find out what onyx means in a specific file, open it in a vector editor and inspect the swatch and object values directly. A swatch labeled onyx can hold any value. A file extension such as SVG, EPS, AI or PDF also does not guarantee that the artwork consists of editable vector paths, so confirm that by inspecting the objects themselves.

Some logos use an image of the banded stone itself, such as a photograph or scan of onyx used as a texture. That texture is normally raster image data, embedded in or placed alongside the vector artwork. It will not scale the way paths do, and you cannot recolor it by editing a swatch. It usually needs a flat-color fallback for small sizes, single-color printing, embroidery or engraving. A raster preview or thumbnail of a logo is not a reliable source for its true color values either.

If the onyx you want comes from another organization's palette or a downloaded logo, being able to download the file does not grant permission to modify or reuse its artwork, typefaces or trademarks. Check the applicable license or usage terms separately.

What remains unsettled

The available evidence does not establish an official or industry-wide value for onyx, and it includes no measurements of the stone's color. If you need the exact onyx used by a particular brand, product or software palette, get the documented values from whoever defined that palette rather than relying on the name.