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Digital Gemology: gemstone and diamond cut library

by cultrodistroversion 1.0.2i★ –iRuns in the cloud
Registry namecom.digitalgemology/cut-library

Install

Overview

Description from the maker (original English)

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

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

  • Connection: Runs in the cloud
  • Transport: Streamable HTTP
  • Category: Design, images & audio

Install

Pick the AI app you use, then copy the settings.

Before you install

You need

Which app do you use?

Pick your app above. We remember it, so next time the button says “Install in …”.

Works in Claude on the web, desktop and mobile:

  1. Open Settings → Connectors
  2. Press Add custom connector
  3. Paste the address below and press Add
  4. If it asks you to sign in, sign in with the maker
SettingsConnectors1+ Add2https://…3
https://digitalgemology.com/mcp

Run this in your terminal

claude mcp add --transport http cut-library https://digitalgemology.com/mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "cut-library": {
      "url": "https://digitalgemology.com/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "cut-library": {
      "type": "http",
      "url": "https://digitalgemology.com/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

ChatGPT connects only to servers on the internet:

  1. Open ChatGPT on the web → Settings → Connectors (Apps)
  2. Press Create or Add (some plans need Developer mode under Advanced first)
  3. Paste the address below, give it a name and save
  4. If it asks you to sign in, sign in with the maker
SettingsConnectors1+ Create2https://…3
https://digitalgemology.com/mcp

Menu names can differ slightly by plan and over time.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Tool names and descriptions exactly as the server reported them on Nov 6, 2026. The maker wrote them, not us; we show them as plain text.

  • search_cuts

    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

  • get_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.

  • best_cuts_for_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.

  • cut_in_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?'.

  • list_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.

  • get_cut_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 cu

  • compare_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

  • recommend_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 sh

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

  • ✓ Pass

    Maker matches the repo

    The registry name was verified against the domain digitalgemology.com (the registry checks domain ownership)

  • … Not checked yet

    Still maintained

    We have not read this repo from GitHub yet

  • … Not checked yet

    Has a licence

    We have not read this repo from GitHub yet

  • ✓ Pass

    Endpoint responds

    Responded in 20 ms (HTTP 200)

  • – Not applicable

    Sign-in with OAuth

    No sign-in needed

  • ✓ Pass

    No hidden instructions in tool descriptions

    Read 8 tool descriptions and found no hidden instructions to the AI

Compared with others in Design, images & audioi

  • More stars than 0% of the other 2202 servers in this category
  • Published to the registry more recently than 83% of the other 2202 servers in this category
  • Basic checks equal to or better than 100% of the other 2202 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Digital Gemology: gemstone and diamond cut library safe?

It passed 3 of 3 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.0.2) reached the registry 6 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: Figma Context MCP, Claude Real Video, Figma MCP Server

Alternatives

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

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

Four remote Model Context Protocol servers from Digital Gemology:

ServerEndpointRegistry nameWhat it does
Cut libraryhttps://digitalgemology.com/mcpcom.digitalgemology/cut-librarySearch 40 gem cuts and 5 Platonic solids; 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
Gemology glossaryhttps://digitalgemology.com/mcp/glossarycom.digitalgemology/gemology-glossaryDefine 328 gemology terms: every word on a diamond grading report, the four Cs, clarity characteristics, treatments, gem testing, colored gemstones, and how brilliance, fire and scintillation are measured
  • 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.

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.

ToolWhat it does
define_termOne term ("crown angle", "feather", "fluorescence", "scintillation"): a short definition, more detail, where it appears on a grading report, how Digital Gemology measures it, related terms, and its page.
search_glossaryFind terms by a word or a question ("what do the girdle words mean", "why does a diamond sparkle").
list_glossaryEvery term, or every term in one of 15 topics, with a one-line definition and its page.

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

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.

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

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