Laboratory
International Gemological Institute (IGI)
Antwerp, Belgium
Diamonds, lab-grown diamonds, coloured stones, jewellery
The International Gemological Institute (IGI), founded in Antwerp in 1975, has about 30 laboratories worldwide and is one of the largest graders of laboratory-grown diamonds.
What it does
Diamond and laboratory-grown diamond grading, coloured stone and jewellery reports, and education through its School of Gemology.
Laboratories include New York, Mumbai, Hong Kong, Bangkok and Dubai.
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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