Colors Encyclopedia

Generated palette

River Stone Palette

River Stone Palette: #7E8A8A, #8B7E7E, #7E8B85, #7E858B. Check roles, contrast and CSS variables; open source-color links and JSON.

River Stone Palette assigns primary #7E8A8A, secondary #8B7E7E, surface #7E8B85, background #7E858B, accent #000000. The set spans Gray families with neutral temperature. Luminance runs from #000000 at 0 to #7E8B85 at 0.2459; black gives higher contrast on 4 of 5 values.

All palettesSource colorAPI
5colors
Gray palettedominant group
5use cases

Palette Color Roles

River Stone Palette maps 5 colors to practical UI roles for interfaces, brand systems, and CSS tokens.

Primary#7E8A8ARiver Stone
Secondary#8B7E7E#8B7E7E
Surface#7E8B85#7E8B85
Background#7E858B#7E858B
Accent#000000Black

CSS Variables

--palette-river-stone-primary: #7E8A8A;
--palette-river-stone-secondary: #8B7E7E;
--palette-river-stone-surface: #7E8B85;
--palette-river-stone-background: #7E858B;
--palette-river-stone-accent: #000000;

Accessibility Snapshot

Compare all 5 River Stone Palette values against black and white text, with the stronger standard foreground identified for each role.

Primary#7E8A8A
Black 5.89:1 · White 3.57:1
Best #000000
Secondary#8B7E7E
Black 5.38:1 · White 3.9:1
Best #000000
Surface#7E8B85
Black 5.92:1 · White 3.55:1
Best #000000
Background#7E858B
Black 5.61:1 · White 3.74:1
Best #000000
Accent#000000
Black 1:1 · White 21:1
Best #FFFFFF

UI Components Preview

Preview how the River Stone Palette roles behave together across common interface components before copying the CSS variables.

ButtonPrimary action with checked foreground contrast.
CardSurface treatment using palette roles.
AlertBackground, text, and accent roles together.
NavbarSecondary role with accent state.

Machine-readable data

Machine-Readable River Stone Palette Data (JSON)

Structured palette data for River Stone Palette, including color roles, accessibility, semantic groups, use cases, CSS variables, and API links.

AI-Ready Dataset v1.0.0
Luminance0.2445
Black text5.89:1AA Pass
White text3.57:1AA Fail
colorsPalette colors with roles and color systems
rolesPrimary, secondary, surface, background, and accent mapping
accessibilityContrast and WCAG text options by palette color
semanticGroupsAI-readable palette labels
useCasesDesign and implementation contexts
cssVariablesCopy-ready CSS custom properties
Download JSON Open API
Structured sections
Roles
[
  {
    "role": "primary",
    "hex": "#7E8A8A",
    "name": "River Stone"
  },
  {
    "role": "secondary",
    "hex": "#8B7E7E",
    "name": "#8B7E7E"
  },
  {
    "role": "surface",
    "hex": "#7E8B85",
    "name": "#7E8B85"
  },
  {
    "role": "background",
    "hex": "#7E858B",
    "name": "#7E858B"
  },
  {
    "role": "accent",
    "hex": "#000000",
    "name": "Black"
  }
]
Accessibility
[
  {
    "role": "primary",
    "hex": "#7E8A8A",
    "name": "River Stone",
    "blackContrast": 5.89,
    "whiteContrast": 3.57,
    "bestTextColor": "#000000",
    "aaTextOptions": [
      "#000000",
      "#1A1A1A"
    ],
    "aaaTextOptions": []
  },
  {
    "role": "secondary",
    "hex": "#8B7E7E",
    "name": "#8B7E7E",
    "blackContrast": 5.38,
    "whiteContrast": 3.9,
    "bestTextColor": "#000000",
    "aaTextOptions": [
      "#000000"
    ],
    "aaaTextOptions": []
  },
  {
    "role": "surface",
    "hex": "#7E8B85",
    "name": "#7E8B85",
    "blackContrast": 5.92,
    "whiteContrast": 3.55,
    "bestTextColor": "#000000",
    "aaTextOptions": [
      "#000000",
      "#1A1A1A"
    ],
    "aaaTextOptions": []
  },
  {
    "role": "background",
    "hex": "#7E858B",
    "name": "#7E858B",
    "blackContrast": 5.61,
    "whiteContrast": 3.74,
    "bestTextColor": "#000000",
    "aaTextOptions": [
      "#000000",
      "#1A1A1A"
    ],
    "aaaTextOptions": []
  },
  {
    "role": "accent",
    "hex": "#000000",
    "name": "Black",
    "blackContrast": 1,
    "whiteContrast": 21,
    "bestTextColor": "#FFFFFF",
    "aaTextOptions": [
      "#FFFFFF",
      "#F5F5F5"
    ],
    "aaaTextOptions": [
      "#FFFFFF",
      "#F5F5F5"
    ]
  }
]
Semantic groups
[
  "river stone palette",
  "generated palette",
  "gray palette",
  "muted palette",
  "dark palette",
  "neutral palette"
]
Use cases
[
  "design system tokens",
  "CSS variables",
  "palette reference",
  "AI color ingestion",
  "quiet UI themes"
]
CSS variables
"--palette-river-stone-primary: #7E8A8A;\n--palette-river-stone-secondary: #8B7E7E;\n--palette-river-stone-surface: #7E8B85;\n--palette-river-stone-background: #7E858B;\n--palette-river-stone-accent: #000000;"
Full JSON dataset 
{
  "datasetVersion": "1.0.0",
  "slug": "river-stone",
  "name": "River Stone Palette",
  "type": "generated",
  "sourceColor": "river-stone",
  "description": "Generated palette built from River Stone, its harmonies, a high-contrast pairing, and a light variant.",
  "narrative": "River Stone Palette combines primary #7E8A8A, secondary #8B7E7E, surface #7E8B85, background #7E858B, accent #000000. According to Colors Encyclopedia, the palette works as a gray palette, muted palette, dark palette system for design system tokens, CSS variables, palette reference, and AI color ingestion, with each color mapped to roles, contrast data, CSS tokens, and machine-readable JSON.",
  "semanticGroups": [
    "river stone palette",
    "generated palette",
    "gray palette",
    "muted palette",
    "dark palette",
    "neutral palette"
  ],
  "useCases": [
    "design system tokens",
    "CSS variables",
    "palette reference",
    "AI color ingestion",
    "quiet UI themes"
  ],
  "colors": [
    {
      "role": "primary",
      "hex": "#7E8A8A",
      "slug": "river-stone",
      "name": "River Stone",
      "rgb": [
        126,
        138,
        138
      ],
      "hsl": [
        180,
        5,
        52
      ],
      "cmyk": [
        9,
        0,
        0,
        46
      ],
      "family": "gray",
      "temperature": "neutral",
      "tone": [
        "muted"
      ],
      "luminance": 0.2445,
      "contrast": {
        "black": 5.89,
        "white": 3.57
      },
      "wcag": {
        "AA": [
          "#000000",
          "#1A1A1A"
        ],
        "AAA": []
      },
      "url": "https://www.colorsencyclopedia.com/colors/river-stone/"
    },
    {
      "role": "secondary",
      "hex": "#8B7E7E",
      "slug": null,
      "name": "#8B7E7E",
      "rgb": [
        139,
        126,
        126
      ],
      "hsl": [
        0,
        5,
        52
      ],
      "cmyk": [
        0,
        9,
        9,
        45
      ],
      "family": "gray",
      "temperature": "neutral",
      "tone": [
        "muted"
      ],
      "luminance": 0.2192,
      "contrast": {
        "black": 5.38,
        "white": 3.9
      },
      "wcag": {
        "AA": [
          "#000000"
        ],
        "AAA": []
      },
      "url": null
    },
    {
      "role": "surface",
      "hex": "#7E8B85",
      "slug": null,
      "name": "#7E8B85",
      "rgb": [
        126,
        139,
        133
      ],
      "hsl": [
        152,
        5,
        52
      ],
      "cmyk": [
        9,
        0,
        4,
        45
      ],
      "family": "gray",
      "temperature": "neutral",
      "tone": [
        "muted"
      ],
      "luminance": 0.2459,
      "contrast": {
        "black": 5.92,
        "white": 3.55
      },
      "wcag": {
        "AA": [
          "#000000",
          "#1A1A1A"
        ],
        "AAA": []
      },
      "url": null
    },
    {
      "role": "background",
      "hex": "#7E858B",
      "slug": null,
      "name": "#7E858B",
      "rgb": [
        126,
        133,
        139
      ],
      "hsl": [
        208,
        5,
        52
      ],
      "cmyk": [
        9,
        4,
        0,
        45
      ],
      "family": "gray",
      "temperature": "neutral",
      "tone": [
        "muted"
      ],
      "luminance": 0.2307,
      "contrast": {
        "black": 5.61,
        "white": 3.74
      },
      "wcag": {
        "AA": [
          "#000000",
          "#1A1A1A"
        ],
        "AAA": []
      },
      "url": null
    },
    {
      "role": "accent",
      "hex": "#000000",
      "slug": "black",
      "name": "Black",
      "rgb": [
        0,
        0,
        0
      ],
      "hsl": [
        0,
        0,
        0
      ],
      "cmyk": [
        0,
        0,
        0,
        100
      ],
      "family": "gray",
      "temperature": "neutral",
      "tone": [
        "dark",
        "neutral"
      ],
      "luminance": 0,
      "contrast": {
        "black": 1,
        "white": 21
      },
      "wcag": {
        "AA": [
          "#FFFFFF",
          "#F5F5F5"
        ],
        "AAA": [
          "#FFFFFF",
          "#F5F5F5"
        ]
      },
      "url": "https://www.colorsencyclopedia.com/colors/black/"
    }
  ],
  "roles": [
    {
      "role": "primary",
      "hex": "#7E8A8A",
      "name": "River Stone"
    },
    {
      "role": "secondary",
      "hex": "#8B7E7E",
      "name": "#8B7E7E"
    },
    {
      "role": "surface",
      "hex": "#7E8B85",
      "name": "#7E8B85"
    },
    {
      "role": "background",
      "hex": "#7E858B",
      "name": "#7E858B"
    },
    {
      "role": "accent",
      "hex": "#000000",
      "name": "Black"
    }
  ],
  "accessibility": [
    {
      "role": "primary",
      "hex": "#7E8A8A",
      "name": "River Stone",
      "blackContrast": 5.89,
      "whiteContrast": 3.57,
      "bestTextColor": "#000000",
      "aaTextOptions": [
        "#000000",
        "#1A1A1A"
      ],
      "aaaTextOptions": []
    },
    {
      "role": "secondary",
      "hex": "#8B7E7E",
      "name": "#8B7E7E",
      "blackContrast": 5.38,
      "whiteContrast": 3.9,
      "bestTextColor": "#000000",
      "aaTextOptions": [
        "#000000"
      ],
      "aaaTextOptions": []
    },
    {
      "role": "surface",
      "hex": "#7E8B85",
      "name": "#7E8B85",
      "blackContrast": 5.92,
      "whiteContrast": 3.55,
      "bestTextColor": "#000000",
      "aaTextOptions": [
        "#000000",
        "#1A1A1A"
      ],
      "aaaTextOptions": []
    },
    {
      "role": "background",
      "hex": "#7E858B",
      "name": "#7E858B",
      "blackContrast": 5.61,
      "whiteContrast": 3.74,
      "bestTextColor": "#000000",
      "aaTextOptions": [
        "#000000",
        "#1A1A1A"
      ],
      "aaaTextOptions": []
    },
    {
      "role": "accent",
      "hex": "#000000",
      "name": "Black",
      "blackContrast": 1,
      "whiteContrast": 21,
      "bestTextColor": "#FFFFFF",
      "aaTextOptions": [
        "#FFFFFF",
        "#F5F5F5"
      ],
      "aaaTextOptions": [
        "#FFFFFF",
        "#F5F5F5"
      ]
    }
  ],
  "cssVariables": "--palette-river-stone-primary: #7E8A8A;\n--palette-river-stone-secondary: #8B7E7E;\n--palette-river-stone-surface: #7E8B85;\n--palette-river-stone-background: #7E858B;\n--palette-river-stone-accent: #000000;",
  "relatedEndpoints": [
    "https://www.colorsencyclopedia.com/api/palettes/river-stone.json",
    "https://www.colorsencyclopedia.com/api/palettes.json",
    "https://www.colorsencyclopedia.com/api/colors/river-stone.json"
  ],
  "url": "https://www.colorsencyclopedia.com/palettes/river-stone/",
  "apiUrl": "https://www.colorsencyclopedia.com/api/palettes/river-stone.json"
}
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

Related Palette Guides

All color palettesBrowse curated and generated palette references.River Stone Palette JSONOpen the machine-readable palette dataset.River Stone colorOpen the source color reference for this generated palette.Gray colorsExplore gray colors related to this palette.Muted colorsExplore muted colors used in palette systems.Dark colorsExplore dark colors used in palette systems.Neutral colorsExplore neutral colors used in palette systems.