# io.github.JacobiusMakes/diamond-mcp (remote · diamond-mcp.stienhardt.workers.dev)

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

- Trust score: 74/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-20

## Components

- remote · `diamond-mcp.stienhardt.workers.dev`: 74/100 (this document), [markdown](https://verifymcp.io/servers/jacobiusmakes-diamond-mcp/diamond-mcp.md), [page](https://verifymcp.io/servers/jacobiusmakes-diamond-mcp/diamond-mcp)
- mcpb · `diamond-mcp-0.2.6.mcpb`: 54/100, [markdown](https://verifymcp.io/servers/jacobiusmakes-diamond-mcp/https-github-com-jacobiusmakes-diamond-mcp-releases-download-v0-2-6-diamond-mcp.md), [page](https://verifymcp.io/servers/jacobiusmakes-diamond-mcp/https-github-com-jacobiusmakes-diamond-mcp-releases-download-v0-2-6-diamond-mcp)

## Channel facts

- Endpoint: `https://diamond-mcp.stienhardt.workers.dev/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.2.9`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-09-20.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 78/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 1033 tokens (~93/item across 11 items; 11 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 60/100
  - Stability observed for 18 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 97/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 91% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 11 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 12 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the io.github.JacobiusMakes/diamond-mcp server?

io.github.JacobiusMakes/diamond-mcp is a hosted endpoint at https://diamond-mcp.stienhardt.workers.dev/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http jacobiusmakes-diamond-mcp 'https://diamond-mcp.stienhardt.workers.dev/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "jacobiusmakes-diamond-mcp": {
      "url": "https://diamond-mcp.stienhardt.workers.dev/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "jacobiusmakes-diamond-mcp": {
      "type": "http",
      "url": "https://diamond-mcp.stienhardt.workers.dev/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.jacobiusmakes-diamond-mcp]
url = "https://diamond-mcp.stienhardt.workers.dev/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "jacobiusmakes-diamond-mcp": {
      "type": "remote",
      "url": "https://diamond-mcp.stienhardt.workers.dev/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add jacobiusmakes-diamond-mcp --url 'https://diamond-mcp.stienhardt.workers.dev/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  jacobiusmakes-diamond-mcp:
    url: "https://diamond-mcp.stienhardt.workers.dev/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "jacobiusmakes-diamond-mcp": {
      "Transport": "http",
      "Url": "https://diamond-mcp.stienhardt.workers.dev/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add jacobiusmakes-diamond-mcp -t streamable-http -u 'https://diamond-mcp.stienhardt.workers.dev/mcp'
```

### Other

```json
{
  "mcpServers": {
    "jacobiusmakes-diamond-mcp": {
      "type": "http",
      "url": "https://diamond-mcp.stienhardt.workers.dev/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-20 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 57 to 60. That category is still filling its 30-day observation window: 17 days of observed history at the previous scan, 18 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-18 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 50 to 53. That category is still filling its 30-day observation window: 15 days of observed history at the previous scan, 16 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-16 (score 72, +1)

No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-15 (score 71, 0)

- [functional regression] Tool coverage: 100% → 91%
- [functional] New tool “compare_diamonds”

### 2026-09-13 (score 71, +1)

No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-10 (score 70, +1)

No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-09 (score 69, 0)

- [security] Tool “define” rewrote its description, which is the text the model reads
- [security] Tool “search_inventory” rewrote its description, which is the text the model reads
- [functional] Server version: 0.2.5 → 0.2.6

### 2026-09-08 (score 69, +1)

- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “search_inventory” rewrote its description, which is the text the model reads
- [security] Tool “get_product” rewrote its description, which is the text the model reads
- [security] Tool “dutch_marquise_definition” rewrote its description, which is the text the model reads
- [cosmetic] “get_product” reworded the description of “id”

## MCP tools (11)

### `compare_diamonds` (~77 tokens)

Compare supplied diamond specifications

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.

Input parameters:

- `stones` (array, required)

### `verify_diamond_report` (~101 tokens)

Where and how to verify a diamond grading 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.

Input parameters:

- `lab` (string, required): The grading lab that issued the report: GIA, IGI, or GCAL. Case insensitive.
- `report_number` (string, required): The report number printed on the grading report.

### `faceup_size` (~135 tokens)

Approximate face up size for a shape and carat weight

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.

Input parameters:

- `carat` (number, required): Carat weight greater than zero, for example 1.0 or 1.52.
- `shape` (string, required): One of: round, oval, emerald, dutch_marquise. Case insensitive. Spaces and hyphens are accepted.

### `dutch_marquise_definition` (~53 tokens)

The published definition of the Dutch Marquise cut

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.

### `lab_grown_grading_landscape` (~50 tokens)

Who grades Lab Grown Diamonds today

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` (~37 tokens)

Latest tracked Lab Grown Diamond retail price reading

The latest tracked retail price reading for Lab Grown Diamonds, with source and date. Market context for shoppers, not investment guidance.

### `about_stienhardt` (~41 tokens)

Fact sheet: 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` (~106 tokens)

Define a diamond or gemology term

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.

Input parameters:

- `term` (string, required): The term to define, for example "Dutch Marquise" or "bow-tie effect". Case insensitive.

### `search_encyclopedia` (~111 tokens)

Keyword search across the diamond 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.

Input parameters:

- `limit` (integer): Maximum number of results to return, 1 to 10. Default 5.
- `query` (string, required): Keywords to search for, for example "bow tie" or "lab grown durability".

### `search_inventory` (~140 tokens)

Search Stienhardt's live 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.

Input parameters:

- `limit` (integer): Max results (default 5, max 10).
- `query` (string, required): What the shopper is looking for, in plain words.

### `get_product` (~79 tokens)

Product detail from Stienhardt's live catalog

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.

Input parameters:

- `id` (string, required): Exact id returned by search_inventory: a Shopify product gid or stienhardt:diamond:SKU.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/jacobiusmakes-diamond-mcp/diamond-mcp#diagnostics

## Score history

- 2026-09-20: 74
- 2026-09-19: 73
- 2026-09-18: 73
- 2026-09-17: 72
- 2026-09-16: 72
- 2026-09-15: 71
- 2026-09-14: 71
- 2026-09-13: 71
- 2026-09-12: 70
- 2026-09-11: 70
- 2026-09-10: 70
- 2026-09-09: 69
- 2026-09-08: 69
- 2026-09-07: 68
- 2026-09-06: 68
- 2026-09-05: 67
- 2026-09-04: 67
- 2026-09-03: 66
- 2026-09-02: 66

## Common questions

### What is the io.github.JacobiusMakes/diamond-mcp server?

io.github.JacobiusMakes/diamond-mcp is listed in the public MCP registry as io.github.JacobiusMakes/diamond-mcp. Sourced diamond and gemology tools for AI assistants, with 90 encyclopedia entries. This page covers its hosted endpoint (https://diamond-mcp.stienhardt.workers.dev/mcp).

### Is the io.github.JacobiusMakes/diamond-mcp server safe to use?

io.github.JacobiusMakes/diamond-mcp scores 74 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the io.github.JacobiusMakes/diamond-mcp server expose?

io.github.JacobiusMakes/diamond-mcp exposes 11 tools: compare_diamonds, verify_diamond_report, faceup_size, dutch_marquise_definition, lab_grown_grading_landscape, and 6 more. Their descriptions and schemas cost roughly 930 tokens of context every time the server is loaded.

### Does the io.github.JacobiusMakes/diamond-mcp server require authentication?

No. We connected to io.github.JacobiusMakes/diamond-mcp without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the io.github.JacobiusMakes/diamond-mcp server still maintained?

io.github.JacobiusMakes/diamond-mcp is still listed as active in the MCP registry. We last reached this channel on 20 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://diamond-mcp.stienhardt.workers.dev/mcp
- Repository: https://github.com/JacobiusMakes/diamond-mcp
- Website: https://stienhardt.com/?utm_source=mcp_registry&utm_medium=referral&utm_campaign=diamond_mcp&utm_content=registry_website
- Changelog RSS feed: https://verifymcp.io/servers/jacobiusmakes-diamond-mcp/diamond-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/jacobiusmakes-diamond-mcp/diamond-mcp.json
- HTML version of this page: https://verifymcp.io/servers/jacobiusmakes-diamond-mcp/diamond-mcp