Ministry of Gems — Gemmology & Gemstones
Gemology & gemmology: 215 FGAA terms, 25 handbooks, live gem stock, signed passport verification.
| Endpoint | https://mog-concierge.33guruge.workers.dev/mcp (streamable-http) |
|---|---|
| Registry version | 2.0.1 |
| Now | 13 tools · grade A (100) · pin ts_177e9455f03424c7aff318659a6ebae7 · protocol 2025-06-18 |
| First / last listed | 2026-11-01 02:58 UTC / 2026-11-01 02:58 UTC |
| Grade over time | 2026-11-01: A (100), 13 tools |
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Tools: define_gem_term search_gem_knowledge list_gem_terms verify_gem_passport search_gem_inventory sapphire_price_guide gem_properties compare_gems birthstone_for_month gem_care_guide get_gem_product lab_report_check faceup_size_estimate
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. params: term* |
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. params: query*, limit |
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. params: section |
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, treatment and certificate status. Use when a buyer asks whether a stone or its passport is genuine, or params: stone_id* |
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, earrings), carat range and price range. Every loose gem returned carries a verifiable Digital Gemst params: query, type, min_carat, max_carat, min_price_aud, max_price_aud, in_stock_only, limit |
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 guide rather than a market index. params: origin, carat |
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, "tsavorite" to garnet. params: species* |
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". params: gem_a*, gem_b* |
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. params: month* |
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. params: gemstone* |
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. params: handle* |
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 unrecognised lab names. Routes to the lab; does not verify the report itself. params: lab*, report_number |
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, emerald, pear, marquise, princess, radiant, heart, trillion. params: species, shape, carat* |
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