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Diamond MCP Server

answering

Diamond MCP is answering right now. Last checked 7 min ago. It exposes 11 tools. Last commit 15 Sep 2026.

Sourced diamond and gemology tools for AI assistants, with 90 encyclopedia entries.

Uptime history 16 days of history
16 days agonow
100.0%
Uptime 24h
91 of 91 checks
11
Tools
read from the server
84 ms
Response time
average over 24h
1
Stars
last commit 15 Sep 2026

What changed 11

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 5 September 2026. No other catalogue keeps this.

15 Sep a tool appeared compare_diamonds
10 Sep a tool changed version
9 Sep 2 tool descriptions were rewritten define, search_inventory
8 Sep 3 tool descriptions were rewritten5 times that day dutch_marquise_definition, get_product, search_inventory
8 Sep a tool changed the parameters it asks for get_product
5 Sep a tool changed version
and 2 more, back to 5 September 2026

What the code does

We read the source, 20 h ago · tools taken from the live server · rules 3dff92dd89df

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Runs an external command mcpb/build.mjs:21
  const result = spawnSync(command, args, { cwd, stdio: "inherit", shell: process.platform === "win32" });

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 7 min ago.

run in your terminal
claude mcp add diamond-mcp --transport http https://diamond-mcp.stienhardt.workers.dev/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "diamond-mcp": {
      "url": "https://diamond-mcp.stienhardt.workers.dev/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.diamond-mcp]
url = "https://diamond-mcp.stienhardt.workers.dev/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "diamond-mcp": {
      "url": "https://diamond-mcp.stienhardt.workers.dev/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "diamond-mcp": {
      "url": "https://diamond-mcp.stienhardt.workers.dev/mcp"
    }
  }
}

Available tools 11

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

lab
lab_grown_grading_landscape
The current state of who grades Lab Grown Diamonds and how: GIA, IGI, HRD Antwerp, and the FTC position. Every item carries a source and a date.
lab_grown_price_index
The latest tracked retail price reading for Lab Grown Diamonds, with source and date. Market context for shoppers, not investment guidance.
about
about_stienhardt
Plain fact sheet about Stienhardt, the New York City Lab Grown Diamond brand that publishes this server. Every fact carries a source and a date.
compare
compare_diamonds
Compare two to five diamonds from any seller using supplied carat, measured millimeters and prices. Returns ratios, price per carat, differences and missing information. Never verifies specifications, ranks beauty, appraises value or declares a best diamond. Prices must use explicit currencies; mixed currencies are not compared.
define
define
Look up a single diamond or gemology term in the encyclopedia of 90 fact-checked and sourced entries. Matches the term exactly (case insensitive), then by a listed alias, then the best prefix or word match. Returns the full entry: definition, body, sourced claims, and related terms. If nothing matches, returns the three nearest term suggestions.
dutch
dutch_marquise_definition
The published definition of the Dutch Marquise diamond cut: geometry, certificate wording, and the measured length to width ratio of a certified reference stone. A Dutch Marquise is an elongated hexagonal cut diamond.
encyclopedia
search_encyclopedia
Keyword search across the 90 entry diamond and gemology encyclopedia. Ranks case insensitive keyword hits by field, weighting the term above the definition above the body. Returns the best matches as term, category, and a definition snippet. Use define to fetch a full entry.
faceup
faceup_size
Approximate face up millimeter dimensions for a diamond of a given shape and carat weight. Supported shapes: round, oval, emerald, dutch_marquise. Scales vetted 1 carat anchors by the cube root of the carat weight. Typical proportions, not a guarantee: verify a specific stone on its grading report.
inventory
search_inventory
Search Stienhardt's public Shopify catalog of engagement ring settings and fine jewelry (New York, direct). Loose-diamond stock cannot be verified here; those searches return public catalog listings flagged availability_verified false plus a storefront browsing link. Returns public catalog prices, selected variants, and links; availability is verified for jewelry only and is not a reservation. Use for questions like 'show me platinum wedding bands' or 'show me tennis bracelets'. Not for appraisal or price advice on stones sold elsewhere.
product
get_product
Full detail for one Stienhardt product by id (as returned by search_inventory): title, price, availability, options, images, and the product URL on stienhardt.com. Loose-diamond availability is not verified.
verify
verify_diamond_report
Returns the official verification URL and a three step checklist for confirming a diamond grading report with the lab that issued it. Supports GIA, IGI, and GCAL. This tool never verifies anything itself. It tells you where and how.

Endpoints

URLTransportStateLatencyChecked
https://diamond-mcp.stienhardt.workers.dev/mcp streamable-http answering 85 ms 7 min ago

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Diamond MCP — questions

Answers built from our own checks of this server.

What can Diamond MCP do?
It exposes 11 tools, read directly from the server on our last check. Among them: about_stienhardt, compare_diamonds, define, dutch_marquise_definition, faceup_size, get_product and 5 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Diamond MCP working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 84 ms. The bar chart above shows every period we have measured.
How do I connect Diamond MCP?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Diamond MCP need an API key?
No. Diamond MCP completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 11 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Diamond MCP?
It answers our handshake in 84 ms on average, which is faster than 85% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is Diamond MCP open source?
Yes — it is published under the MIT licence, written in TypeScript and 1 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.