# moissanite-tools

MCP server providing density-corrected carat-to-millimeter calculations for moissanite, GIA grading references, and ISO 8653 ring size conversions.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed, Gemini CLI
- Author: FITINY
- License: MIT · policy=link-only · description only; the file stays with the author
- Source: https://github.com/FITINY/moissanite-tools
- Updated: 2026-08-28
- HTML: https://affpapa.org/en/nevibecode/mcp/moissanite-tools

## What it does

Standard stone charts rely on diamond density (3.52 g/cm³), which creates a 9% disparity when applied to moissanite (3.21 g/cm³). The server resolves this difference through GIA formulas scaled by relative material density, calculating round brilliant dimensions directly instead of copying tables.

The system bundles six tools: `carat_to_mm`, `mm_to_carat`, `grading_scale`, `ring_size_convert`, `necklace_length`, and `stud_appearance`. Beyond weight conversions, it provides references for D–K color and FL–SI clarity grades, alongside ISO 8653 circumference conversions across US, UK, and European standards.

All dimensional math targets standard round brilliant cuts exclusively. Fancy cuts distribute mass differently. That makes this server unsuitable for non-round gems.

## Requirements
- Remote server: `https://mcp.fitiny.com/mcp`

## Install

### Claude Code (native platform)

**Platform CLI: remote server**
```bash
claude mcp add --transport http moissanite-tools https://mcp.fitiny.com/mcp
```

### Codex

**Platform CLI: remote server**
```bash
codex mcp add moissanite-tools --url https://mcp.fitiny.com/mcp
```

### Cursor

**Config file**
File `.cursor/mcp.json`:
```json
{
    "mcpServers": {
        "moissanite-tools": {
            "url": "https://mcp.fitiny.com/mcp"
        }
    }
}
```

### GitHub Copilot

**Config file**
File `.vscode/mcp.json`:
```json
{
    "servers": {
        "moissanite-tools": {
            "type": "http",
            "url": "https://mcp.fitiny.com/mcp"
        }
    }
}
```

### Gemini CLI

**Platform CLI: remote server**
```bash
gemini mcp add -t http moissanite-tools https://mcp.fitiny.com/mcp
```

## When to use it
- Calculate moissanite carat weight from diameter using accurate stone density
- Convert ring measurements between US, UK, and ISO 8653 EU standards
- Inspect GIA color and clarity grading scale definitions
- Check earring stud appearance and necklace resting lengths

## Example prompts
- Convert a 6.5 mm moissanite to carat weight using moissanite-tools
- What is the US equivalent for a UK M ring size?
- Explain VVS1 clarity and D color using grading_scale

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