Digital Gemology: gem identification and gemstone properties

Digital Gemology MCP servers: cut library, gem identification, gemology lessons, glossary

Four remote Model Context Protocol servers from Digital Gemology:

• Transport: Streamable HTTP, stateless
• Registry: official MCP Registry
• Sign-in: none. Read-only and free to use.
• Protocol versions: 2026-07-28, 2025-11-25, 2025-06-18, 2025-03-26

This repository holds the servers' public description, their registry listings and the open data they serve. The servers run on digitalgemology.com.

Cut library tools (/mcp)

Gem identification tools (/mcp/gems)

The values that Digital Gemology's free Refractometer, Polariscope, Dichroscope and Spectroscope use, for diamond, moissanite, cubic zirconia, ruby, sapphire, emerald and amethyst. A match is a lead, not an identification: a laboratory report is the proof.

Gemology lessons tools (/mcp/learn)

Gemology glossary tools (/mcp/glossary)

328 terms, each with its own page under digitalgemology.com/learn/glossary. Grading report terms follow GIA, with IGI where it differs.

Connect

Claude Code

claude mcp add --transport http digital-gemology https://digitalgemology.com/mcp

claude mcp add --transport http digital-gemology-gems https://digitalgemology.com/mcp/gems claude mcp add --transport http digital-gemology-learn https://digitalgemology.com/mcp/learn claude mcp add --transport http digital-gemology-glossary https://digitalgemology.com/mcp/glossary

Claude Desktop, Cursor, VS Code and other clients that take a JSON config:

{

"mcpServers": { "digital-gemology": { "type": "http", "url": "https://digitalgemology.com/mcp" }, "digital-gemology-gems": { "type": "http", "url": "https://digitalgemology.com/mcp/gems" }, "digital-gemology-learn": { "type": "http", "url": "https://digitalgemology.com/mcp/learn" }, "digital-gemology-glossary": { "type": "http", "url": "https://digitalgemology.com/mcp/glossary" } } }

Try it with curl

curl -s https://digitalgemology.com/mcp \

-H "Content-Type: application/json" -H "Accept: application/json, text/event-stream" \ -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"best_cuts_for_gemstone","arguments":{"gemstone":"moissanite"}}}'

Other ways in

• REST API: https://digitalgemology.com/api/cuts, /api/cuts/{slug}, /api/gemstones, /api/cut-index (OpenAPI)
• JSON files: gem data, all lessons, the glossary, the whole cut library
• A2A agent: https://digitalgemology.com/a2a (agent card)
• For language models: llms.txt, and a Markdown copy of every page
• Docs: digitalgemology.com/about/agents

Data

data/ holds the Digital Gemology Cut Performance Index: ray-traced light-performance scores for 40 gem cuts and 5 Platonic solids in seven gemstones, diamond, moissanite, cubic zirconia, ruby, sapphire, emerald and amethyst (315 rows; 37 cuts are scored, and the rest are listed with the reason). Ruby and sapphire are both corundum, so they share one set of figures; color and absorption are not part of the trace. The method and every column are explained on the index page.

• DOI: 10.5281/zenodo.23844870
• Also on Kaggle and Hugging Face
• Wikidata: Q141955945

License

The data and this documentation are licensed under CC BY 4.0: use and share freely, with credit to Digital Gemology and a link to https://digitalgemology.com. The 3D models and faceting diagrams the tools link to are sold separately under their own license.

Contact

support@digitalgemology.com