Digital Gemology: gemstone and diamond cut library

com.digitalgemologyPublished by digitalgemology.comOfficial publisherv1.0.2Updated Nov 1, 2026

Gemstone and diamond cuts: ray-traced brilliance, fire and sparkle in 7 gems, 3D and faceting files

VerifiedStreamable HTTPWeb executableData & AnalyticsBusiness & Commerce

Overview

AI-generated overview

Remote MCP server for Digital Gemology's gem cut library: search 45 cuts, compare ray-traced light performance in seven gemstones, and get prices and checkout…

What you can do
  • Search cuts and Platonic solids by name, style, shape or use, with facets, size, price and checkout links
  • Read one cut's specifications, scores in all seven gemstones, Q&A and page
  • Rank the top brilliants and jewelry cuts in a gemstone, or score one cut in one stone against the T73 round brilliant
  • Compare two cuts side by side and recommend cuts by brilliance, fire, scintillation, spread, tilt or leakage
  • List the seven gemstones with refractive index, critical angle, dispersion, hardness and specific gravity
  • Return Cut Performance Index scores for every cut in every gemstone
When to use it
Useful when someone is choosing a gemstone cut or comparing options — for example oval versus pear for a sapphire — or wants ray-traced light-performance data, faceting specifications, or a link to buy a 3D model or faceting diagram.
Requirements
A remote Streamable HTTP endpoint; no sign-in, API key or environment variables are needed. The site's Google sign-in applies only to people using it in a browser.
Before you install
Results include prices and checkout links, so purchases happen on the site, not through the assistant. Files carry a personal-use license; business use needs a commercial license from the provider. Scores are the site's own index against its T73 benchmark, and ruby and sapphire share one set of figures.

Installation

In SourceWeft

  1. Open Digital Gemology: gemstone and diamond cut library 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%2Fcut-library/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-gemstone-and-diamond-cu": {
      "type": "http",
      "url": "https://digitalgemology.com/mcp"
    }
  }
}

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

8

search_cuts

Search the cut library

Search Digital Gemology's gem cuts and Platonic solids by name, style, shape or use (for example 'square step cut', 'round brilliant for moissanite', 'historic cushion', 'pear'). Returns each match with its page, facets, size, price and checkout links. Give a gemstone to add the cut's brilliance, fire and scintillation in that stone and to sort by them.

Parameterssortlimitqueryshapecategorygemstonecutting_files

get_cut

Get one cut

Everything about one cut: what it is, measured specifications (facets, angles, depth, size, index gear), brilliance, fire and scintillation in all seven gemstones against the T73, the products with prices and checkout links, its questions and answers, and its page.

Parameterscutrequiredgemstone

best_cuts_for_gemstone

Best cuts for a gemstone

The top ten brilliants and the top ten jewelry cuts in one gemstone, ranked by brilliance, fire and scintillation added together, with the stone's optical constants.

Parameterskindgemstonerequired

cut_in_gemstone

One cut in one gemstone

How one cut performs in one gemstone: its headline, eight measured scores against the T73 round brilliant in the same stone, and its pros and cons. For questions like 'is an oval a good cut for sapphire?'.

Parameterscutrequiredgemstonerequired

list_gemstones

List the gemstones

The seven gemstones every cut is measured in, with refractive index, critical angle, dispersion, hardness and specific gravity, and the three best cuts of each kind.

Takes no parameters.

get_cut_scores

Cut Performance Index scores

Scores from the Digital Gemology Cut Performance Index for every cut we sell: overall, brilliance, fire, scintillation, tilt, symmetry, spread, shape-norm and leakage, ray traced separately in diamond, moissanite, cubic zirconia, ruby, sapphire, emerald and amethyst, with each cut's place in its material. Filter by cut, category or material; with no filter, every row. Figures are unrounded. Never compare or rank scores across materials. Ruby and sapphire share one refractive index, so the same figures. Cuts not yet scored come with the reason.

Parameterscutcategorymaterial

compare_cuts

Compare two cuts

Two cuts side by side in one gemstone: overall, brilliance, fire, scintillation, tilt, face-up spread and leakage from the Cut Performance Index, each cut's place in that stone, facets and size, and the products with prices and checkout links. For questions like 'oval or pear for my sapphire?'.

Parameterscut_arequiredcut_brequiredgemstone

recommend_cut

Recommend a cut

The best cuts in one gemstone for what matters to the buyer: overall light performance, brilliance, fire, scintillation (sparkle), spread (looks bigger for its weight), tilt (stays bright when tilted) or leakage (least light lost). Filter by family or outline. Returns a ranked short list with each cut's page and checkout links.

Parameterslimitshapecategorygemstonerequiredpriority

Version history

1
  1. v1.0.2LatestNov 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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