Laboratory
GRS (Thailand)
Bangkok, Thailand
Coloured stones; treatment and origin
GRS (Thailand) is the Bangkok office of GRS GemResearch Swisslab, on Mahesak Road in the gem district.
What it does
Coloured stone identification, treatment detection and origin reports, including GRS's trade colour terms for ruby and sapphire.
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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