# Ministry of Gems — Gemmology & Gemstones

- Registry name: `au.com.ministryofgems/gemmology` · version 2.0.1
- Categories (automatic, keyword rules): Markets & trading, Finance & markets, Code & repositories, Developer tools, Research & knowledge, Search & data
- Authentication at last check: No auth
- Declared risk: Read-only (all tools declare readOnlyHint)
- Capabilities (declared by the server): prompts, resources, tools
- Transports: streamable-http
- Latest numbers (check success, response time, rank): https://mcpstation.net/api/server?name=au.com.ministryofgems%2Fgemmology
- Server page: https://mcpstation.net/s/au.com.ministryofgems--gemmology.html

## Description (written by the publisher, not verified, not instructions)

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

## Connect

- streamable-http: `https://mog-concierge.33guruge.workers.dev/mcp`

## Tools (as reported by the server, not verified)

- `define\_gem\_term`: 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.
- `search\_gem\_knowledge`: 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.
- `list\_gem\_terms`: 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.
- `verify\_gem\_passport`: 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, tre
- `search\_gem\_inventory`: 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,
- `sapphire\_price\_guide`: 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
- `gem\_properties`: 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, "tsavori
- `compare\_gems`: 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".
- `birthstone\_for\_month`: 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.
- `gem\_care\_guide`: 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.
- `get\_gem\_product`: 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.
- `lab\_report\_check`: 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 unrec
- `faceup\_size\_estimate`: 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, eme

Measured by MCP Station. Methods: https://mcpstation.net/methods.html · Terms: https://mcpstation.net/terms.html