Laboratory
GUILD Gem Laboratories
Hong Kong, Hong Kong SAR
Coloured stones, pearls
Guild Gem Laboratories is a gem laboratory in Hong Kong with a branch in Bangkok.
What it does
Coloured stone and pearl identification, treatment detection 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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