Ministry of Gems — Gemmology & Gemstones

by ministryofgems.com.au · remote · no sign-in to list tools · v2.0.1 · published by au.com.ministryofgems

Gemology & gemmology: 215 FGAA terms, 25 handbooks, live gem stock, signed passport verification.

Changes · 8

Compare Registry entry

13 tools: 8 change things and 5 only read.

Scanned Oct 21, 2026

Deletes or cancels0Claude Code: deny
Can't be undone0Claude Code: ask
Changes things8Claude Code: ask: see these tools
Only reads5Claude Code: allow: see these tools

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http gemmology https://mog-concierge.33guruge.workers.dev/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

13 tools

Changes things 8Creates or changes something that can be changed back.Claude Code: ask

birthstone_for_monthThe modern and traditional birthstones for a month, from the FGAA-reviewed table, with a link to The Birthstone Handbook for history, treatments to expect and buying guidance.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
The modern and traditional birthstones for a month, from the FGAA-reviewed table, with a link to The Birthstone Handbook for history, treatments to expect and buying guidance. Accepts a month name or number.
Annotations the server declares
- title: Birthstone by month
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
define_gem_termLook up a gemmological term in The Gem Lexicon of Ministry of Gems — 215 definitions verified by an FGAA-qualified gemmologist.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Look up a gemmological term in The Gem Lexicon of Ministry of Gems — 215 definitions verified by an FGAA-qualified gemmologist. Returns the definition, its subject section, and a citable anchor URL. Use for terms such as padparadscha, corundum, parti sapphire, unheated, or asterism.
Annotations the server declares
- title: Define a gemmological term
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
faceup_size_estimateApproximate face-up millimetre dimensions for a stone of a given species, shape and carat weight — and, unlike diamond-only calculators, corrected for specific gravity, so a 2 ct s…No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Approximate face-up millimetre dimensions for a stone of a given species, shape and carat weight — and, unlike diamond-only calculators, corrected for specific gravity, so a 2 ct sapphire, spinel, emerald or opal is sized correctly rather than as if it were diamond. Shapes: round, oval, cushion, emerald, pear, marquise, princess, radiant, heart, trillion.
Annotations the server declares
- title: Face-up size for any gem species
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
gem_care_guideWhether warm soapy water, an ultrasonic cleaner or a steam cleaner is safe for a given gemstone, plus everyday-wear notes, from the FGAA-reviewed care table.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Whether warm soapy water, an ultrasonic cleaner or a steam cleaner is safe for a given gemstone, plus everyday-wear notes, from the FGAA-reviewed care table. Covers sapphire and ruby, diamond, emerald, opal, pearl, tanzanite, tourmaline and more.
Annotations the server declares
- title: How to clean and wear a gem
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
gem_propertiesMohs hardness, refractive index, specific gravity, birefringence and crystal system for a gem species (diamond, corundum/sapphire/ruby, emerald, spinel, opal, tourmaline, garnet, q…No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Mohs hardness, refractive index, specific gravity, birefringence and crystal system for a gem species (diamond, corundum/sapphire/ruby, emerald, spinel, opal, tourmaline, garnet, quartz and more), from the FGAA-reviewed Gem Data Tables. Accepts trade names — "sapphire" resolves to corundum, "tsavorite" to garnet.
Annotations the server declares
- title: Gem physical properties
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
lab_report_checkThe issuing laboratory's own verification page and a four-step checklist for confirming a gemstone or diamond grading report — GIA, IGI, GRS, SSEF, Gübelin, AGL, Lotus, GIT, HRD, G…No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
The issuing laboratory's own verification page and a four-step checklist for confirming a gemstone or diamond grading report — GIA, IGI, GRS, SSEF, Gübelin, AGL, Lotus, GIT, HRD, GCAL and others, including the coloured-stone laboratories diamond tools omit. Explains what "FGAA" means and flags unrecognised lab names. Routes to the lab; does not verify the report itself.
Annotations the server declares
- title: Where to verify a laboratory report
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
sapphire_price_guideWhat natural sapphires actually cost per carat in Australian dollars, from Ministry of Gems' published price guide: bands by origin (Australian, Ceylon) and size, with the stone co…No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
What natural sapphires actually cost per carat in Australian dollars, from Ministry of Gems' published price guide: bands by origin (Australian, Ceylon) and size, with the stone count behind each band and the date the bands were computed. Answers "how much is a 2 carat sapphire" honestly, as a house guide rather than a market index.
Annotations the server declares
- title: Sapphire price per carat
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
verify_gem_passportCryptographically verify a Ministry of Gems Digital Gemstone Passport by stone ID.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Cryptographically verify a Ministry of Gems Digital Gemstone Passport by stone ID. Recomputes the SHA-256 digest of the signed record and checks its Ed25519 (EdDSA) signature against the house public key, then returns the attested record: species, carat, dimensions, cut, colour, clarity, origin, treatment and certificate status. Use when a buyer asks whether a stone or its passport is genuine, or before quoting any fact about a specific Ministry of Gems stone.
Annotations the server declares
- title: Verify a Digital Gemstone Passport
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false

Only reads 5Looks things up and changes nothing.Claude Code: allow

compare_gemsSide-by-side physical properties of two gem species with a plain verdict on which is harder, and a note on toughness — the half of durability the hardness scale does not show.No findings
Why it is in this group
- The name "compare_gems" says "compare": a word for reading.
Description, as the server wrote it
Side-by-side physical properties of two gem species with a plain verdict on which is harder, and a note on toughness — the half of durability the hardness scale does not show. Good for "sapphire or diamond for an everyday ring".
Annotations the server declares
- title: Compare two gems
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
get_gem_productFull detail for one Ministry of Gems product by handle or URL: specifications, description, price in AUD, availability, variants, images, the Digital Gemstone Passport link for loo…No findings
Why it is in this group
- The name "get_gem_product" says "get": a word for reading.
Description, as the server wrote it
Full detail for one Ministry of Gems product by handle or URL: specifications, description, price in AUD, availability, variants, images, the Digital Gemstone Passport link for loose stones, and a direct checkout link. Use after search_gem_inventory.
Annotations the server declares
- title: Product detail
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
list_gem_termsList the gemmological terms available in The Gem Lexicon, optionally filtered to one subject section.No findings
Why it is in this group
- The name "list_gem_terms" says "list": a word for reading.
Description, as the server wrote it
List the gemmological terms available in The Gem Lexicon, optionally filtered to one subject section. Use this to discover what can be defined before calling define_gem_term.
Annotations the server declares
- title: List lexicon terms
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
search_gem_inventorySearch the live Ministry of Gems catalogue of natural loose gemstones and finished jewellery — Ceylon and Australian sapphires, rubies, spinels, Australian opals, emeralds and more…No findings
Why it is in this group
- The name "search_gem_inventory" says "search": a word for reading.
Description, as the server wrote it
Search the live Ministry of Gems catalogue of natural loose gemstones and finished jewellery — Ceylon and Australian sapphires, rubies, spinels, Australian opals, emeralds and more — with prices in Australian dollars, availability, carat weight and a link to buy. Filter by type (gems, ring, pendant, earrings), carat range and price range. Every loose gem returned carries a verifiable Digital Gemstone Passport.
Annotations the server declares
- title: Search Ministry of Gems stock
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
search_gem_knowledgeKeyword search across the Ministry of Gems gemmological reference library — 215 lexicon definitions and 25 full-length buyer's handbooks, searched in full text across every section…No findings
Why it is in this group
- The name "search_gem_knowledge" says "search": a word for reading.
Description, as the server wrote it
Keyword search across the Ministry of Gems gemmological reference library — 215 lexicon definitions and 25 full-length buyer's handbooks, searched in full text across every section. Returns ranked results, each with the matched passage and a citable URL that deep-links to the chapter.
Annotations the server declares
- title: Search the gemmology library
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 2.0.1. Values in angle brackets are yours to fill in.

claude mcp add --transport http gemmology https://mog-concierge.33guruge.workers.dev/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [
      "mcp__gemmology__search_gem_knowledge",
      "mcp__gemmology__list_gem_terms",
      "mcp__gemmology__search_gem_inventory",
      "mcp__gemmology__compare_gems",
      "mcp__gemmology__get_gem_product"
    ],
    "ask": [
      "mcp__gemmology__define_gem_term",
      "mcp__gemmology__verify_gem_passport",
      "mcp__gemmology__sapphire_price_guide",
      "mcp__gemmology__gem_properties",
      "mcp__gemmology__birthstone_for_month",
      "mcp__gemmology__gem_care_guide",
      "mcp__gemmology__lab_report_check",
      "mcp__gemmology__faceup_size_estimate"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as gemmology. Review it before you use it.

Keep track

Get told when this server's tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/au.com.ministryofgems/gemmology/changes.xml

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Source: MCP Registry. Synced Oct 21, 2026, 17:45 UTC.

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