Koskamo

Digital Gemology MCP

An official MCP server providing access to Digital Gemology's gemstone and diamond cut library. It allows AI agents to search for cuts, retrieve detailed specifications, view light performance scores (brilliance, fire, scintillation) across seven gemstone types, and access pricing and checkout links. It also includes tools for gem identification based on optical properties.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

Digital Gemology MCP logo, by Digital GemologyVendor evidenceStreamable HTTPNo sign-inEndpoint checked 2026-11-01Operated by Digital Gemology
MCP endpoint (Streamable HTTP)
https://digitalgemology.com/mcp
Vendor documentation

What you can do with it

  • Search for gemstone cuts by name, style, or shape
  • Retrieve light performance scores for specific cuts in different gemstones
  • Identify gemstones based on optical test readings
  • Compare light performance between two different cuts

Source and maintenance

Vendor evidenceRegistry 1.0.2
mcp-registry: com.digitalgemology/cut-library@1.0.2Source repositoryProject website
Maintenance checked

Protocol and capabilities

Server
digital-gemology 1.0.0
MCP protocol
2025-06-18
Tools
8 advertised
Resources
Not advertised
Resource templates
Not advertised
Prompts
Not advertised
Server-advertised capabilities
{
  "tools": {
    "listChanged": false
  }
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

Digital Gemology's cut library: gem cuts and Platonic solids sold as 3D models (STEP, 3DM, STL, OBJ, FBX, GLB) and GemCad faceting diagrams, each measured by ray tracing in diamond, moissanite, cubic zirconia, ruby, sapphire, emerald and amethyst. Use search_cuts to find cuts, get_cut for specifications, scores, prices and checkout links, best_cuts_for_gemstone for the top ten in a stone, cut_in_gemstone for the pros and cons of one cut in one stone, and list_gemstones for optical constants. Link people to the cut's page; give the checkout link when they want to buy. Files carry a personal-use license; business use needs a commercial license from support@digitalgemology.com. Scores are out of 100 from the site's own light census, with the T73 round brilliant as the benchmark. No sign-in or key is needed; the site's Google sign-in is for people in a browser only. Use get_cut_scores for the Cut Performance Index (overall, brilliance, fire and more, in all seven stones; the same data as /api/cut-index). Use compare_cuts for two cuts side by side and recommend_cut for the best cuts in a stone by what the buyer cares about.

Tools

8 advertised

search_cuts — Search the cut library
Advertised by the server during the last successful anonymous check.
Advertised read-only

Search Digital Gemology's gem cuts and Platonic solids by name, style, shape or use (for example 'square step cut', 'round brilliant for moissanite', 'historic cushion', 'pear'). Returns each match with its page, facets, size, price and checkout links. Give a gemstone to add the cut's brilliance, fire and scintillation in that stone and to sort by them.

search_cuts input schema
{
  "type": "object",
  "properties": {
    "sort": {
      "enum": [
        "relevance",
        "total",
        "brilliance",
        "fire",
        "scintillation",
        "facets",
        "name"
      ],
      "type": "string",
      "description": "relevance (default with a query), total (brilliance + fire + scintillation, the default with a gemstone and no query), brilliance, fire, scintillation, facets (most first) or name."
    },
    "limit": {
      "type": "integer",
      "default": 10,
      "maximum": 50,
      "minimum": 1,
      "description": "How many cuts to return, 1 to 50; 10 if left out."
    },
    "query": {
      "type": "string",
      "description": "Free text. Leave it out to list every cut that fits the filters."
    },
    "shape": {
      "enum": [
        "round",
        "elongated",
        "square",
        "triangular",
        "other",
        "solid"
      ],
      "type": "string",
      "description": "Outline of the cut."
    },
    "category": {
      "enum": [
        "brilliants",
        "jewelry",
        "historic",
        "house",
        "platonic"
      ],
      "type": "string",
      "description": "brilliants, jewelry (fancy and step cuts), historic, house (our own designs) or platonic (solids, 3D files only)."
    },
    "gemstone": {
      "enum": [
        "diamond",
        "moissanite",
        "cubic-zirconia",
        "ruby",
        "sapphire",
        "emerald",
        "amethyst"
      ],
      "type": "string",
      "description": "Gemstone, as its slug."
    },
    "cutting_files": {
      "type": "boolean",
      "description": "Only cuts that are also sold as GemCad cutting files."
    }
  },
  "additionalProperties": false
}
search_cuts annotations
{
  "title": "Search the cut library",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
get_cut — Get one cut
Advertised by the server during the last successful anonymous check.
Advertised read-only

Everything about one cut: what it is, measured specifications (facets, angles, depth, size, index gear), brilliance, fire and scintillation in all seven gemstones against the T73, the products with prices and checkout links, its questions and answers, and its page.

get_cut input schema
{
  "type": "object",
  "required": [
    "cut"
  ],
  "properties": {
    "cut": {
      "type": "string",
      "description": "The cut's slug or name, for example 'asscher', 'T73' or 'Old European'."
    },
    "gemstone": {
      "enum": [
        "diamond",
        "moissanite",
        "cubic-zirconia",
        "ruby",
        "sapphire",
        "emerald",
        "amethyst"
      ],
      "type": "string",
      "description": "Optional: also return the pros and cons of this cut in this stone."
    }
  },
  "additionalProperties": false
}
get_cut annotations
{
  "title": "Get one cut",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
best_cuts_for_gemstone — Best cuts for a gemstone
Advertised by the server during the last successful anonymous check.
Advertised read-only

The top ten brilliants and the top ten jewelry cuts in one gemstone, ranked by brilliance, fire and scintillation added together, with the stone's optical constants.

best_cuts_for_gemstone input schema
{
  "type": "object",
  "required": [
    "gemstone"
  ],
  "properties": {
    "kind": {
      "enum": [
        "brilliants",
        "jewelry",
        "both"
      ],
      "type": "string",
      "default": "both",
      "description": "brilliants (round cuts), jewelry (fancy and step shapes) or both."
    },
    "gemstone": {
      "enum": [
        "diamond",
        "moissanite",
        "cubic-zirconia",
        "ruby",
        "sapphire",
        "emerald",
        "amethyst"
      ],
      "type": "string",
      "description": "Gemstone, as its slug."
    }
  },
  "additionalProperties": false
}
best_cuts_for_gemstone annotations
{
  "title": "Best cuts for a gemstone",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
cut_in_gemstone — One cut in one gemstone
Advertised by the server during the last successful anonymous check.
Advertised read-only

How one cut performs in one gemstone: its headline, eight measured scores against the T73 round brilliant in the same stone, and its pros and cons. For questions like 'is an oval a good cut for sapphire?'.

cut_in_gemstone input schema
{
  "type": "object",
  "required": [
    "cut",
    "gemstone"
  ],
  "properties": {
    "cut": {
      "type": "string",
      "description": "The cut's slug or name."
    },
    "gemstone": {
      "enum": [
        "diamond",
        "moissanite",
        "cubic-zirconia",
        "ruby",
        "sapphire",
        "emerald",
        "amethyst"
      ],
      "type": "string",
      "description": "Gemstone, as its slug."
    }
  },
  "additionalProperties": false
}
cut_in_gemstone annotations
{
  "title": "One cut in one gemstone",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
list_gemstones — List the gemstones
Advertised by the server during the last successful anonymous check.
Advertised read-only

The seven gemstones every cut is measured in, with refractive index, critical angle, dispersion, hardness and specific gravity, and the three best cuts of each kind.

list_gemstones input schema
{
  "type": "object",
  "properties": {},
  "additionalProperties": false
}
list_gemstones annotations
{
  "title": "List the gemstones",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
get_cut_scores — Cut Performance Index scores
Advertised by the server during the last successful anonymous check.
Advertised read-only

Scores from the Digital Gemology Cut Performance Index for every cut we sell: overall, brilliance, fire, scintillation, tilt, symmetry, spread, shape-norm and leakage, ray traced separately in diamond, moissanite, cubic zirconia, ruby, sapphire, emerald and amethyst, with each cut's place in its material. Filter by cut, category or material; with no filter, every row. Figures are unrounded. Never compare or rank scores across materials. Ruby and sapphire share one refractive index, so the same figures. Cuts not yet scored come with the reason.

get_cut_scores input schema
{
  "type": "object",
  "properties": {
    "cut": {
      "type": "string",
      "description": "The cut's slug or name, for example 'oval' or 'DG-M5'."
    },
    "category": {
      "enum": [
        "brilliants",
        "jewelry",
        "historic",
        "house",
        "platonic"
      ],
      "type": "string",
      "description": "brilliants, jewelry, historic, house or platonic."
    },
    "material": {
      "enum": [
        "diamond",
        "moissanite",
        "cubic-zirconia",
        "ruby",
        "sapphire",
        "emerald",
        "amethyst"
      ],
      "type": "string",
      "description": "One stone (diamond, moissanite, cubic-zirconia, ruby, sapphire, emerald or amethyst); leave it out for all seven."
    }
  },
  "additionalProperties": false
}
get_cut_scores annotations
{
  "title": "Cut Performance Index scores",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
compare_cuts — Compare two cuts
Advertised by the server during the last successful anonymous check.
Advertised read-only

Two cuts side by side in one gemstone: overall, brilliance, fire, scintillation, tilt, face-up spread and leakage from the Cut Performance Index, each cut's place in that stone, facets and size, and the products with prices and checkout links. For questions like 'oval or pear for my sapphire?'.

compare_cuts input schema
{
  "type": "object",
  "required": [
    "cut_a",
    "cut_b"
  ],
  "properties": {
    "cut_a": {
      "type": "string",
      "description": "The first cut's slug or name, for example 'oval'."
    },
    "cut_b": {
      "type": "string",
      "description": "The second cut's slug or name, for example 'pear'."
    },
    "gemstone": {
      "enum": [
        "diamond",
        "moissanite",
        "cubic-zirconia",
        "ruby",
        "sapphire",
        "emerald",
        "amethyst"
      ],
      "type": "string",
      "description": "The stone to compare them in; diamond if left out."
    }
  },
  "additionalProperties": false
}
compare_cuts annotations
{
  "title": "Compare two cuts",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
recommend_cut — Recommend a cut
Advertised by the server during the last successful anonymous check.
Advertised read-only

The best cuts in one gemstone for what matters to the buyer: overall light performance, brilliance, fire, scintillation (sparkle), spread (looks bigger for its weight), tilt (stays bright when tilted) or leakage (least light lost). Filter by family or outline. Returns a ranked short list with each cut's page and checkout links.

recommend_cut input schema
{
  "type": "object",
  "required": [
    "gemstone"
  ],
  "properties": {
    "limit": {
      "type": "integer",
      "default": 5,
      "maximum": 20,
      "minimum": 1,
      "description": "How many cuts to return, 1 to 20; 5 if left out."
    },
    "shape": {
      "enum": [
        "round",
        "elongated",
        "square",
        "triangular",
        "other"
      ],
      "type": "string",
      "description": "Only cuts with this outline. All if left out."
    },
    "category": {
      "enum": [
        "brilliants",
        "jewelry",
        "historic",
        "house"
      ],
      "type": "string",
      "description": "Only this family: brilliants, jewelry, historic or house. All if left out."
    },
    "gemstone": {
      "enum": [
        "diamond",
        "moissanite",
        "cubic-zirconia",
        "ruby",
        "sapphire",
        "emerald",
        "amethyst"
      ],
      "type": "string",
      "description": "Gemstone, as its slug."
    },
    "priority": {
      "enum": [
        "overall",
        "brilliance",
        "fire",
        "scintillation",
        "spread",
        "tilt",
        "leakage"
      ],
      "type": "string",
      "default": "overall",
      "description": "What to rank by; leakage ranks the least light lost first. overall if left out."
    }
  },
  "additionalProperties": false
}
recommend_cut annotations
{
  "title": "Recommend a cut",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
296 ms
95th percentile latency
296 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 296 ms · metadata changed · 8 tool(s)

Connect from your client

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This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http digital-gemology-mcp https://digitalgemology.com/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add digital-gemology-mcp --url https://digitalgemology.com/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable digital-gemology-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "digital-gemology-mcp": {
      "url": "https://digitalgemology.com/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "digital-gemology-mcp": {
      "type": "streamableHttp",
      "url": "https://digitalgemology.com/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start digital-gemology-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "digital-gemology-mcp": {
      "type": "http",
      "url": "https://digitalgemology.com/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http digital-gemology-mcp https://digitalgemology.com/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.
Claude Desktop configuration
{
  "mcpServers": {
    "digital-gemology-mcp": {
      "url": "https://digitalgemology.com/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "digital-gemology-mcp": {
      "serverUrl": "https://digitalgemology.com/mcp"
    }
  }
}

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