identify-gemstone SKILL.md skillA
identify-gemstone from pjt222/agent-almanac is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add pjt222/agent-almanac/identify-gemstone@v1.0Pins v1.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- pjt222/agent-almanac
- Path
i18n/caveman-lite/skills/identify-gemstone/SKILL.md- Versions recorded
- 4
- Latest version
- v1.0, committed Aug 17, 2026
- First version recorded
- Apr 19, 2026
- Size
- 16,833 bytes
- Repository stars
- 43
- License
- MIT
Identify gemstones using optical properties, physical tests, and inclusion analysis. Covers refractive index, specific gravity, pleochroism, spectroscopy indicators, and common simulant detection. Use when identifying an unknown gemstone, verifying a seller's claim about species identity, distinguishing natural stones from simulants or synthetics, building gemological literacy through structured observation, or identifying rough material before cutting to ensure safe handling.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Identify Gemstone Identify gemstones using systematic physical and optical property testing, inclusion analysis, and elimination against known species profiles. ## When to Use - You have an unknown gemstone or suspect gemstone and want to identify the species - You need to verify a seller's claim about a gemstone's identity - You want to distinguish a natural gemstone from a common simulant or synthetic - You are building gemological literacy through structured observation and testing - You need to identify rough material before cutting to ensure safe handling ## Inputs - **Required**: A gemstone specimen (loose stone preferred; mounted stones limit testing) - **Optional**: Refractometer with contact liquid (RI fluid, 1.81 standard) - **Optional**: Dichroscope (for pleochroism testing) - **Optional**: Chelsea colour filter - **Optional**: Specific gravity balance or heavy liquids - **Optional**: 10x loupe or gemological microscope - **Optional**: UV lamp (long-wave 365nm and short-wave 254nm) - **Optional**: Polariscope (for optic character determination) ## Procedure ### Step 1: Visual Inspection …
Read the whole file at its exact version.
How to install
mdr add pjt222/agent-almanac/identify-gemstone@sha256:d5862047823e7775The line at the top of this page pins the label v1.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_fiiu2iyz6cp6asmy)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, between Apr 19, 2026 and Aug 17, 2026, about one every 40 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0 latest | 2026-08-17 | a784899 | 16,833 B | A | view · diff |
| v1.0 | 2026-06-05 | 33b561c | 16,804 B | A | view · diff |
| v1.0 | 2026-04-24 | b4968e1 | 16,788 B | A | view · diff |
| v1.0 | 2026-04-19 | e334ebd | 16,842 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (16833 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
pjt222/agent-almanac · 43 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_fiiu2iyz6cp6asmy GET https://markdownregistry.com/api/v1/resolve?ref=pjt222/agent-almanac/identify-gemstone GET https://markdownregistry.com/api/v1/blob/d5862047823e77750471e916553493df4a3c6945ad4f5599b0f9f33b46832651
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.