Ministry of Gems — Gemmology & Gemstones

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      "title": "Ministry of Gems® — Gemmology & Gemstones",
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  "tools": [
    {
      "name": "define_gem_term",
      "title": "Define a gemmological term",
      "readOnly": true,
      "destructive": false,
      "openWorld": false,
      "description": "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.…"
    },
    {
      "name": "search_gem_knowledge",
      "title": "Search the Ministry of Gems library",
      "readOnly": true,
      "destructive": false,
      "openWorld": false,
      "description": "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 re…"
    },
    {
      "name": "list_gem_terms",
      "title": "List lexicon terms",
      "readOnly": true,
      "destructive": false,
      "openWorld": false,
      "description": "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."
    },
    {
      "name": "verify_gem_passport",
      "title": "Verify a Digital Gemstone Passport",
      "readOnly": true,
      "destructive": false,
      "openWorld": false,
      "description": "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…"
    },
    {
      "name": "search_gem_inventory",
      "title": "Search Ministry of Gems stock",
      "readOnly": true,
      "destructive": false,
      "openWorld": false,
      "description": "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 A…"
    },
    {
      "name": "sapphire_price_guide",
      "title": "Sapphire price per carat (AUD)",
      "readOnly": true,
      "destructive": false,
      "openWorld": false,
      "description": "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 ban…"
    },
    {
      "name": "gem_properties",
      "title": "Gem physical properties",
      "readOnly": true,
      "destructive": false,
      "openWorld": false,
      "description": "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), fr…"
    },
    {
      "name": "compare_gems",
      "title": "Compare two gems",
      "readOnly": true,
      "destructive": false,
      "openWorld": false,
      "description": "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 d…"
    },
    {
      "name": "birthstone_for_month",
      "title": "Birthstone by month",
      "readOnly": true,
      "destructive": false,
      "openWorld": false,
      "description": "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…"
    },
    {
      "name": "gem_care_guide",
      "title": "How to clean and wear a gem",
      "readOnly": true,
      "destructive": false,
      "openWorld": false,
      "description": "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, emeral…"
    },
    {
      "name": "get_gem_product",
      "title": "Product detail",
      "readOnly": true,
      "destructive": false,
      "openWorld": false,
      "description": "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 di…"
    },
    {
      "name": "lab_report_check",
      "title": "Where to verify a laboratory report",
      "readOnly": true,
      "destructive": false,
      "openWorld": false,
      "description": "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, inc…"
    },
    {
      "name": "faceup_size_estimate",
      "title": "Face-up size for any gem species",
      "readOnly": true,
      "destructive": false,
      "openWorld": false,
      "description": "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, em…"
    }
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