Laboratory
Gübelin Gem Lab
Lucerne, Switzerland
Coloured stones, pearls, origin reports
Gübelin Gem Lab, based in Lucerne, grew from the laboratory of the Gübelin jewellery house, which began testing gems in the 1920s. It is one of the world's leading coloured stone laboratories, with laboratories in Hong Kong and New York.
What it does
Coloured stone and pearl identification, treatment detection and origin reports, diamond grading, and the Gem Passport; research including emerald paternity (DNA-based tracing) work.
Using any laboratory
- Ask what the report will state (identity, treatment, origin, grade) and how long it takes; turnaround and fees change.
- Check a report online with the laboratory's own report-check service, and match the stone to the report.
- Reports from different laboratories can differ, especially on colour grades, treatment and origin. A report is an opinion based on the tests made, not a valuation.
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