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Directory / Digital Gemology: gem identification and gemstone properties

Digital Gemology: gem identification and gemstone properties

Q: Is Digital Gemology: gem identification and gemstone properties MCP server safe?

QAmcp's test on 1 Nov 2026: None of the hidden-instruction wordings we know were found in its tool descriptions. Its error messages showed no secrets or internal details. All 4 of its tools are labeled read-only. Overall it scored 100/100 on 1 Nov 2026. A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

by digitalgemology.com · https://digitalgemology.com/mcp/gems

Identify gemstones by refractive index, birefringence, SG, pleochroism and spectrum. Compare 7 gems

4 tools✓ all read-only✓ no account neededPricing: not listed

Visit website

100 /100

PASS

11 of 11 checks · 1 Nov 2026

Is Digital Gemology: gem identification and gemstone properties MCP server safe?

None of the hidden-instruction wordings we know were found in its tool descriptions.
Its error messages showed no secrets or internal details.
All 4 of its tools are labeled read-only.
Overall it scored 100/100 on 1 Nov 2026.

A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

What it can do

4 tools, in the server's own words.

gem_propertiesread-only

Everything Digital Gemology measures about one gemstone: refractive index (both rays for doubly refractive stones), birefringence, dispersion, specific gravity…

identify_gemread-only

Match a stone's test readings against the seven gemstones Digital Gemology covers and rank them, saying which reading fits and which does not.

compare_gemstonesread-only

Two gemstones side by side, and the tests that tell them apart: refractive index, birefringence (doubling of back facets, polariscope), specific gravity, dispe…

absorption_spectrumread-only

What a hand spectroscope shows for one gemstone: each absorption line and band with its position in nanometres, its cause (for example Cr3+ in ruby) and what i…

Test results

Safe mode: only tools labeled read-only were run. How the test works

✓
ConnectsConnected in 47 ms
pass
✓
Ready for the newest MCP versionUses the latest MCP version (2026-07-28)
pass
✓
Lists its toolsFound 4 tools
pass
✓
Every tool is describedAll 4 tools and their inputs are described
pass
✓
Tools are labeled safe or dangerousEvery tool has a safety label
pass
✓
No known hidden instructionsNone of the hidden-instruction wordings we know were found in tool descriptions. New wordings can get past this check.
pass
✓
Tools work with good inputs
All good
- ✓gem_properties: Worked (169 ms)
- ✓identify_gem: Answered with an error, probably because of our sample input: Give at least one reading: refractive_index, birefringence, specific_gravity, optic_character, pleochroism, spectrum_line_nm, over_the_limi…
- ✓compare_gemstones: Answered with an error, probably because of our sample input: Give two different gemstones.
- ✓absorption_spectrum: Worked (44 ms)
pass
✓
Bad inputs give a clean error
All good
- ✓gem_properties: Refused missing required input "gemstone" with a clear error
- ✓gem_properties: Refused wrong type for "gemstone" with a clear error
- ✓identify_gem: Refused wrong type for "refractive_index" with a clear error
- ✓compare_gemstones: Refused missing required input "gemstone_a" with a clear error
- ✓compare_gemstones: Refused wrong type for "gemstone_a" with a clear error
- ✓absorption_spectrum: Refused missing required input "gemstone" with a clear error
- ✓absorption_spectrum: Refused wrong type for "gemstone" with a clear error
pass
✓
Fast enough
All good
- ✓Connecting took 47 ms
- ✓Listing tools took 43 ms
- ✓Average tool answer: 72 ms
- ✓gem_properties: Slowest tool: gem_properties (169 ms)
pass
✓
No secrets leakedChecked 9 error messages: no secrets or internal details
pass
✓
Follows MCP best practices (not scored yet)Tool names, safety labels and tool list size follow the MCP guide
pass
–
Tools work togetherNo tool's answer could be fed into another tool, so there were no chains to test (not counted either way)
not tested

Test it yourself

Free and open source. Same checks, same score.

npx qamcp-cli https://digitalgemology.com/mcp/gems

Show this score on GitHub

Free for every server in the directory. Paste this into your README: the badge shows the score from our latest test.

[![QAmcp score](https://qamcp.dev/s/com-digitalgemology-gem-identification.svg)](https://qamcp.dev/s/com-digitalgemology-gem-identification.html)

Score over time

1 Nov 2026100

One test so far. New tests will show here.

Reviews

Coming soon: reviews from people who use Digital Gemology: gem identification and gemstone properties, signed in with GitHub, one per person. Reviews never change the score.

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