Ten no-auth tools for sourced diamond education, grading-report guidance, face-up size estimates, a 90-term gemology encyclopedia, and live Stienhardt inventory.
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First seen 2 Oct 2026. One server, whatever directories list it: each directory listing keeps its own page and history.
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| Directory | Listing | Tier | First seen |
|---|---|---|---|
| Smithery | Stienhardt Diamond MCP | - | 2 Oct 2026 |