io.github.JacobiusMakes/diamond-mcp is an MCP server with 10 tools an agent can call, among them about_stienhardt, define, dutch_marquise_definition. It answers at https://diamond-mcp.stienhardt.workers.dev/mcp over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 6 of 6 times since 11 September 2026; the last check, on 20 October 2026, succeeded.
Sourced diamond and gemology tools for AI assistants, with 90 encyclopedia entries.
Description as the publisher wrote it.
| Tool | What it does |
|---|---|
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. |
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: definitio Inputs: term |
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. |
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 Inputs: shape, carat |
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. Inputs: id |
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. |
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 Inputs: query, limit |
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 Inputs: query, limit |
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. Inputs: lab, report_number |
Every block below points at https://diamond-mcp.stienhardt.workers.dev/mcp. Pick your client and copy.
claude mcp add --transport http io-github-jacobiusmakes-diamond https://diamond-mcp.stienhardt.workers.dev/mcp
{
"mcpServers": {
"io-github-jacobiusmakes-diamond": {
"command": "npx",
"args": ["-y", "mcp-remote", "https://diamond-mcp.stienhardt.workers.dev/mcp"]
}
}
}{
"mcpServers": {
"io-github-jacobiusmakes-diamond": {
"url": "https://diamond-mcp.stienhardt.workers.dev/mcp"
}
}
}{
"servers": {
"io-github-jacobiusmakes-diamond": {
"type": "http",
"url": "https://diamond-mcp.stienhardt.workers.dev/mcp"
}
}
}{
"context_servers": {
"io-github-jacobiusmakes-diamond": {
"url": "https://diamond-mcp.stienhardt.workers.dev/mcp"
}
}
}{
"mcpServers": {
"io-github-jacobiusmakes-diamond": {
"serverUrl": "https://diamond-mcp.stienhardt.workers.dev/mcp"
}
}
}{
"mcpServers": {
"io-github-jacobiusmakes-diamond": {
"url": "https://diamond-mcp.stienhardt.workers.dev/mcp"
}
}
}name: io.github.JacobiusMakes/diamond-mcp
version: 0.0.1
schema: v1
mcpServers:
- name: io.github.JacobiusMakes/diamond-mcp
type: streamable-http
url: https://diamond-mcp.stienhardt.workers.dev/mcp{
"mcpServers": {
"io-github-jacobiusmakes-diamond": {
"httpUrl": "https://diamond-mcp.stienhardt.workers.dev/mcp"
}
}
}{
"mcpServers": {
"io-github-jacobiusmakes-diamond": {
"type": "http",
"url": "https://diamond-mcp.stienhardt.workers.dev/mcp"
}
}
}{
"mcpServers": {
"io-github-jacobiusmakes-diamond": {
"url": "https://diamond-mcp.stienhardt.workers.dev/mcp"
}
}
}goose://extension?url=https%3A%2F%2Fdiamond-mcp.stienhardt.workers.dev%2Fmcp&type=streamable_http&id=io-github-jacobiusmakes-diamond&name=io.github.JacobiusMakes/diamond-mcp
It answered our last check on 20 October 2026 in 146 ms. Over 6 checks since 11 September 2026 it answered 6. Status here comes from Neuronto's own probes, not from the publisher.
10, as returned by the server's own tools/list on 12 September 2026: about_stienhardt, define, dutch_marquise_definition, faceup_size, get_product, lab_grown_grading_landscape, lab_grown_price_index, search_encyclopedia, and 2 more.
It answered our last check on 20 October 2026 in 146 ms. Over 6 checks since 11 September 2026 it answered 6.
Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://diamond-mcp.stienhardt.workers.dev/mcp. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.
It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.
Publisher: io.github.jacobiusmakes. Endpoint host: diamond-mcp.stienhardt.workers.dev. ARD identifier: urn:air:io.github.jacobiusmakes:mcp:diamond-mcp.
First indexed 10 September 2026. The tools are exactly what the server returned; nothing on this page
is inferred from its name. Ranking in Neuronto search is never for sale.