Laboratory
GGTL Laboratories
Geneva, Switzerland
Diamonds, coloured stones, pearls
GGTL Laboratories has laboratories in Geneva and in Balzers, Liechtenstein, and works on diamonds, coloured stones and pearls.
What it does
Diamond grading and laboratory-grown diamond detection, coloured stone and pearl identification, and research.
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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