Laboratory
American Gemological Laboratories (AGL)
New York, United States
Coloured stones, origin reports
American Gemological Laboratories (AGL), founded in New York in 1977, was one of the first laboratories to specialise in coloured stones and to issue country-of-origin opinions for them.
What it does
Coloured stone identification, treatment detection and origin reports, with detailed reports for important stones, and colour grading.
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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