Know what’s in
your collection.
Last updated: August 2026
Verify each stone by its measured properties — RI, SG, fluorescence — and keep the record: what it is, how you concluded it, what you paid, and what it looks like.
How a collector uses GemID
A labeled example workflow — this is the intended use, not a customer story.
Verify the stone
Enter what you can measure or observe — RI if you have a refractometer, SG by hydrostatic weighing, UV response, optic character. The engine filters 130 species to ranked candidates and tells you the single best next test.
Save the session
The identification becomes a collection record: every observation, the candidates, your conclusion, photos, carat weight, purchase price, and seller notes.
Build the catalog
Organize by species, source, or case. Import an existing spreadsheet by CSV; export any collection back out. The record syncs across your devices.
The pieces that matter for collectors
Collection tracking
Saved sessions with valuation notes, photos, and organization — the feature page has the full walkthrough.
Reference database
Free property charts for all 130 species — RI, SG, hardness, fluorescence — the same data the engine filters on.
Look-alike separations
Ruby vs. garnet, sapphire vs. tanzanite — the pairs collectors actually mix up, with the tests that separate them.
Examination reports
On Pro: turn any record into a PDF — useful when you sell a piece and want the documentation to travel with it.
Identify free, catalog from $6.99
Identification and the reference database are free. Saved sessions, collections, photos, and CSV import start at Hobbyist — $6.99/month or $49.99/year.
GemID states what a stone is consistent with based on your measurements — it is not a certification, and recorded values are your own notes, not appraisals. Read our full methodology.
Start with the stone nearest you
Enter its properties and see what the engine says it’s consistent with.