# io.github.JacobiusMakes/diamond-mcp (mcpb · diamond-mcp-0.2.6.mcpb)

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

- Trust score: 54/100 (low)
- Change this week: +5
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-20

## Components

- remote · `diamond-mcp.stienhardt.workers.dev`: 74/100, [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 (this document), [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

- Registry: `mcpb`
- Package: `https://github.com/JacobiusMakes/diamond-mcp/releases/download/v0.2.6/diamond-mcp-0.2.6.mcpb`
- Version: `0.2.6`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, 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.

- **Supply Chain Security**: 23/100
  - Malware scan not yet available for this package.
  - Known CVEs were checked across the 95 of 95 dependencies we could resolve, so this covers what we could see, not the whole tree.
  - No install/post-install scripts declared.
  - 31 of 95 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 48/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 10 days ago).
  - Publishes a security disclosure policy (SECURITY.md).
- **Schema Quality & AI Usability**: 78/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 704 tokens (~88/item across 8 items; 8 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 37/100
  - Stability observed for 11 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% 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 8 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

- Download bundle: `https://github.com/JacobiusMakes/diamond-mcp/releases/download/v0.2.6/diamond-mcp-0.2.6.mcpb`

## 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 54, +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.

### 2026-09-18 (score 53, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-17 (score 52, +3)

- [functional improvement] Stability: unverified → 0.27

### 2026-09-09 (score 49)

First indexed and scored.

## MCP tools (8)

### `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".

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/jacobiusmakes-diamond-mcp/https-github-com-jacobiusmakes-diamond-mcp-releases-download-v0-2-6-diamond-mcp#diagnostics

## Score history

- 2026-09-20: 54
- 2026-09-19: 53
- 2026-09-18: 53
- 2026-09-17: 52
- 2026-09-16: 49
- 2026-09-15: 49
- 2026-09-14: 49
- 2026-09-13: 49
- 2026-09-12: 49
- 2026-09-11: 49
- 2026-09-10: 49
- 2026-09-09: 49

## 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 MCPB bundle (https://github.com/JacobiusMakes/diamond-mcp/releases/download/v0.2.6/diamond-mcp-0.2.6.mcpb).

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

io.github.JacobiusMakes/diamond-mcp scores 54 out of 100 on VerifyMCP. It declares no install or post-install scripts. 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 8 tools: verify_diamond_report, faceup_size, dutch_marquise_definition, lab_grown_grading_landscape, lab_grown_price_index, and 3 more. Their descriptions and schemas cost roughly 634 tokens of context every time the server is loaded.

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

io.github.JacobiusMakes/diamond-mcp declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- 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/https-github-com-jacobiusmakes-diamond-mcp-releases-download-v0-2-6-diamond-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/jacobiusmakes-diamond-mcp/https-github-com-jacobiusmakes-diamond-mcp-releases-download-v0-2-6-diamond-mcp.json
- HTML version of this page: https://verifymcp.io/servers/jacobiusmakes-diamond-mcp/https-github-com-jacobiusmakes-diamond-mcp-releases-download-v0-2-6-diamond-mcp