Digital Gemology: gem identification and gemstone properties

com.digitalgemologyPublished by digitalgemology.comOfficial publisherv1.0.0Updated Nov 1, 2026

Identify gemstones by refractive index, birefringence, SG, pleochroism and spectrum. Compare 7 gems

The publisher's own server: Digital Gemology: gemstone and diamond cut library

VerifiedStreamable HTTPWeb executable

Overview

AI-generated overview

Remote MCP server giving assistants gemological data for seven gemstones: properties, reading-based matching, comparisons and absorption spectra.

What you can do
  • Look up one stone's constants, pleochroism and spectrum, plus what refractometer, polariscope and dichroscope show
  • Match test readings such as refractive index, birefringence, specific gravity, optic character or a spectrum line against the seven covered stones and rank the fits
  • Compare two gemstones side by side and see which tests tell them apart
  • Read the absorption lines and bands a hand spectroscope shows, with their cause
When to use it
Useful when someone has instrument readings or a suspected stone and wants a shortlist of candidates, or wants to know which tests distinguish two similar gems such as diamond and moissanite. It is a reference aid, not a substitute for a laboratory report.
Requirements
A remote Streamable HTTP endpoint; no sign-in, API key or local runtime is needed. The README lists the gem identification endpoint separately from the cut library and lessons servers.
Before you install
Coverage is limited to seven gemstones, so a match is only a lead and not an identification; a laboratory report is the proof. The server is described as read-only and free to use, and no credentials are requested.

Installation

In SourceWeft

  1. Open Digital Gemology: gem identification and gemstone properties in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/com.digitalgemology%2Fgem-identification/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "digital-gemology-gem-identification-and": {
      "type": "http",
      "url": "https://digitalgemology.com/mcp/gems"
    }
  }
}

README

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

[mcptry]

Three remote Model Context Protocol servers from Digital Gemology:

ServerEndpointRegistry nameWhat it does
Cut libraryhttps://digitalgemology.com/mcpcom.digitalgemology/cut-librarySearch 45 gem cuts; ray-traced brilliance, fire and scintillation in seven gemstones; compare cuts; recommend a cut; 3D models and GemCad faceting diagrams
Gem identificationhttps://digitalgemology.com/mcp/gemscom.digitalgemology/gem-identificationGemstone properties; match refractive index, birefringence, specific gravity, pleochroism and spectrum lines to seven gemstones; tell two gems apart
Gemology lessonshttps://digitalgemology.com/mcp/learncom.digitalgemology/gemology-lessonsSearch, read and quote 53 gemology lessons: the four Cs, diamond anatomy, grading reports, diamond vs moissanite, historic cuts, bow-ties
  • 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)

ToolWhat it does
search_cutsSearch the cut library by name, style, shape or use ("square step cut", "round brilliant for moissanite", "historic cushion"). Returns each cut's page, facets, size, price and checkout links; give a gemstone to sort by brilliance, fire and scintillation in that stone.
get_cutEverything about one cut: measured specifications (facets, angles, depth, size, index gear), brilliance, fire and scintillation in all seven gemstones, prices and checkout links.
best_cuts_for_gemstoneThe top ten brilliants and top ten jewelry cuts in one gemstone, with the stone's optical constants.
cut_in_gemstoneHow one cut performs in one gemstone: eight measured scores against the T73 round brilliant, with pros and cons.
list_gemstonesThe seven gemstones (diamond, moissanite, cubic zirconia, ruby, sapphire, emerald, amethyst) with refractive index, critical angle, dispersion, hardness and specific gravity.
get_cut_scoresThe Cut Performance Index: overall, brilliance, fire, scintillation, tilt, symmetry, spread, shape-norm and leakage, in all seven gemstones.
compare_cutsTwo cuts side by side in one gemstone: place in the index, every figure, which cut is ahead on each, and links to buy.
recommend_cutThe best cuts for a gemstone, ranked by overall, brilliance, fire, scintillation, spread, tilt or leakage; filter by category or shape.

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.

ToolWhat it does
gem_propertiesOne gemstone: refractive index, birefringence, dispersion, specific gravity, hardness, crystal system, and what each instrument shows.
identify_gemGive any readings (refractive index, birefringence, specific gravity, singly or doubly refractive, pleochroism, a spectrum line, over the refractometer limit). Returns which of the seven stones fit each reading.
compare_gemstonesWhich tests tell two gemstones apart (for example diamond and moissanite), and which do not.
absorption_spectrumThe lines and bands a gemstone shows in a spectroscope, with their cause.

Gemology lessons tools (/mcp/learn)

ToolWhat it does
search_lessonsFind lessons on a topic or question ("what is fire in a diamond").
get_lessonThe full text of one lesson as Markdown, by title or URL.
explain_termShort passages from the lessons that explain a term ("critical angle", "pavilion angle"), each with its link.
list_coursesEvery course and its lessons.

Connect

Claude Code

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

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

json
{  "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" }  }}

Try it with curl

bash
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

Data

data/ holds the Digital Gemology Cut Performance Index: ray-traced light-performance scores for 45 gem cuts in seven gemstones, diamond, moissanite, cubic zirconia, ruby, sapphire, emerald and amethyst (315 rows). 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.

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

[email protected]

Source: README.md at commit 6092507

Tools

4

gem_properties

Gemstone properties

Everything Digital Gemology measures about one gemstone: refractive index (both rays for doubly refractive stones), birefringence, dispersion, specific gravity, hardness, crystal system, critical angle, what a refractometer, polariscope and dichroscope show, its pleochroic colors and the lines and bands a hand spectroscope shows, with links to the free tools.

Parametersgemstonerequired

identify_gem

Match gem test readings

Match a stone's test readings against the seven gemstones Digital Gemology covers and rank them, saying which reading fits and which does not. Give any of: refractive index, birefringence, specific gravity, optic character, pleochroism, a spectrum line, or that the refractometer read over the limit. A match is a lead among seven stones only, not an identification.

Parameterspleochroismbirefringenceover_the_limitoptic_characterrefractive_indexspecific_gravityspectrum_line_nm

compare_gemstones

Tell two gemstones apart

Two gemstones side by side, and the tests that tell them apart: refractive index, birefringence (doubling of back facets, polariscope), specific gravity, dispersion (fire), hardness, pleochroism and spectrum, each with the free tool that shows it. For questions like 'how do I tell diamond from moissanite?'.

Parametersgemstone_arequiredgemstone_brequired

absorption_spectrum

Absorption spectrum

What a hand spectroscope shows for one gemstone: each absorption line and band with its position in nanometres, its cause (for example Cr3+ in ruby) and what it looks like, from Digital Gemology's Spectroscope.

Parametersgemstonerequired

Version history

1
  1. v1.0.0LatestNov 1, 2026

Score

90% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts

    Declare a license in the repository or the registry entry.

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