Laboratory
Guild Gem Laboratory (Thailand)
Bangkok, Thailand
Coloured stones, diamonds
Guild Gem Laboratory Thailand is the Bangkok branch of Guild Gem Laboratories (Hong Kong), in the Jewelry Trade Center.
What it does
Coloured stone identification, treatment and origin reports, and diamond 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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