Gradient Flow Lab

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jewelry-hallmark-reference
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Open, citation-grade reference data for jewelry: hallmarks, gemstones, assay offices, gemological labs, alloy compositions. JSON, CSV, SQLite. MIT licensed. 219…
open-data gold silver
open-data gold silver jewelry json-dataset assay platinum reference-data precious-metals gemstones
Python
•
MIT License
•0•1•0•0•Updated May 22, 2026May 22, 2026

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