# Jacobiusmakes Diamond MCP server

Source: https://glimind.com/server/mcp-registry%2Fio.github.jacobiusmakes%2Fdiamond-mcp
Registry id: `mcp-registry/io.github.jacobiusmakes/diamond-mcp`
Status: live (checked 2026-10-27T07:01:48.313Z)

## Verdict

Jacobiusmakes Diamond MCP server answered 100% of Glimind's liveness checks over 30 days, better than 42% of MCP servers, with 387 ms median handshake and 0 outages in 90 days. Its agent-readiness grade is A (92/100) across 11 tools, costing an agent about 1,583 tokens to load. Checked every few minutes; no tool is ever called.

## Measurements (30 days)

| Metric | Value | Better than |
|---|---|---|
| Uptime, 30 days | 100% | 42% of MCP servers |
| Median handshake latency | 387 ms | 55% of MCP servers |
| p95 handshake latency | 2767 ms | — |
| Checks in 30 days | 4,951 | — |
| Outages, 90 days | 0 | — |
| Median recovery | — | — |
| Agent-readiness score | 92/100 (A) | 72% of MCP servers |
| Tools | 11 | — |
| Tool-list size for an agent | ~1,583 tokens | 57% of MCP servers |
| Days observed | 29 | — |

## Install

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

Claude Code:

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

## Tools (11)

- `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_diamonds`: Compare two to five diamonds from any seller using supplied carat, measured millimeters and prices. Returns ratios, price per carat, differences and missing inf
- `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 lis
- `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
- `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
- `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.c
- `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 abov
- `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 s
- `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 GCA

Measured by Glimind (https://glimind.com): MCP handshake + tool list only, no tool is ever called. CC BY 4.0.