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Ministry of Gems — Gemmology & Gemstones

au.com.ministryofgems/gemmology · v2.0.1

Measured by MCP Station

Description written by the publisher, not verified

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

Connect

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

{
  "mcpServers": {
    "gemmology": {
      "url": "https://mog-concierge.33guruge.workers.dev/mcp"
    }
  }
}

Tools as reported by the server

• 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

Website · JSON · Text for agents · Registry updated 2026-09-18