Diamond MCP server
online · 100% uptimeSourced diamond and gemology tools for AI assistants, with 90 encyclopedia entries.
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If you have run it, two minutes of your experience saves the next person an afternoon.
Diamond tools (11)
write = sends, deletes, buys or postsabout_stienhardtFreePlain 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_diamondsFreeCompare 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.
defineFreeLook 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_marquise_definitionFreeThe 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_sizeFreeApproximate 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.
get_productFreeFull 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.
lab_grown_grading_landscapeFreeThe 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_indexFreeThe latest tracked retail price reading for Lab Grown Diamonds, with source and date. Market context for shoppers, not investment guidance.
search_encyclopediaFreeKeyword 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.
search_inventoryFreeSearch 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.
verify_diamond_reportFreeReturns 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.
Public scan report
scanner v0.1.10 · 2026-10-02 · same rubric, same numbers if you re-run it
- –Code scanpackage could not be scannedn/a
- Live reliabilityremote reachable in 349ms20/20
- Tool poisoning11 tool descriptions checked15/15
- Auth qualityopen endpoint, read-only tools10/15
- Maintenancelast push 17 days ago15/15
- Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
How Diamond compares
Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.
- Safety score
- 91/100
- higher than 85% of 48,243 servers
- Tools
- 11
- the typical server has 7
- Tools that change things
- 0%
- typical: 0%. Fewer write tools means less an agent can break
- Uptime
- 100%
- of our recent checks; the typical remote server answers 100%
- Response time
- 80 ms
- faster than 88% of 30,027 servers
- GitHub stars
- 1
- more than 65% of 28,706 servers
What its tools let an agent do: 11 read
Install Diamond in Claude Code, Cursor or VS Code
claude mcp add --transport http diamond-mcp https://diamond-mcp.stienhardt.workers.dev/mcp
What the publisher says
From the Diamond repository's README, as published. We do not edit it. Read it on GitHub
diamond-mcp
Hosted comparison update (September 14, 2026): see worker/COMPARISON.md for an executable example and availability. Catalog search and measurement: see worker/MEASUREMENT.md for budget filtering, optional measured links, validation and attribution limits.
Diamond education tools for AI assistants, served over the Model Context Protocol (MCP).
The hosted endpoint now has 11 tools: eight education tools, a seller-independent specification comparison, and two read-only inventory tools. The Node source includes comparison; published 0.2.6 packages and the Python server still have the original eight tools. Education tools use a sourced, dated facts file and a 90 entry gemology encyclopedia. The local Python build uses only the standard library and makes no network calls. All education data ships in this repo as facts.json and encyclopedia.json.
Maintained by Stienhardt, a New York City Lab Grown Diamond jeweler.
One-click desktop bundle
Download diamond-mcp-0.2.6.mcpb for a self-contained local bundle. Apps that support MCP Bundles can install it without an account, API key, Python environment, or package-manager command. The bundle runs locally with Node.js and makes no network calls.
For a managed gateway with the hosted tools, connect through Smithery. The Smithery release exposes the same sourced education tools plus live inventory search.
Why a jeweler published an MCP server
People ask AI assistants their diamond questions now. We'd rather those assistants answer with sourced facts than with guesses. So we published the facts in a form an assistant can call: where to verify a grading report, how big a 1.5 carat oval actually looks, what a Dutch Marquise is, who grades Lab Grown Diamonds today, and what the market did last month. Every factual claim in facts.json carries a source and a date.
Honest scope
- Education, not appraisal. Nothing here values, grades, or verifies a stone.
- Always verify a real stone on the grading lab's own site. verifydiamondreport returns the right place and a checklist. It never claims to verify anything itself.
- The price index is market context for shoppers, not investment guidance. A diamond is a love piece, not an investment.
- The local server makes no network calls. It reads facts.json and encyclopedia.json from disk and answers. The hosted endpoint is the one exception: its two inventory tools read the public Shopify catalog, and its /go link counter is described under Hosted endpoint.
Measurable commerce paths
High-intent answers from faceupsize, dutchmarquisedefinition, labgrownpriceindex, and aboutstienhardt include an optional Stienhardt link. Each link carries diamondmcp source tags plus the originating tool. Shape and carat are included for faceup_size. Preserve the query string if you surface one of these links to a user. These tags support downstream attribution if the storefront preserves them. The optional redirect counter measures requests, not unique shoppers, purchases, or revenue.
The tools
Shortened. The full README is on GitHub.
Nothing above is checked by us. What we check is on the safety report.
Diamond: common questions
- Is Diamond MCP server safe?
- Yes, by our scan: it is graded A (91/100). Read the Diamond safety report
- How do I install Diamond?
- It runs remotely at diamond-mcp.stienhardt.workers.dev. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
- Does Diamond need an API key?
- Not as far as the registry entry and our scan can tell: no credentials are declared or required.
- Is Diamond maintained?
- The last commit was 52 days ago (2026-09-14). The latest release is v0.2.9.
- Is Diamond up?
- 100% of our last 28 checks got an answer. We check remote servers about four times a day.
- How does Diamond compare with other MCP servers?
- safety score 91/100 (higher than 85% of 48,243 servers); tools 11 (the typical server has 7); tools that change things 0% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.