Laboratories

Five laboratories, one grading standard

Take-in counters are open to the trade and to private owners. Bring the goods and, if you have one, the existing report.

Ask the laboratory

Questions about a report you hold, a submission you are planning, or a stone you have been offered. Include the report number if there is one.

This form is not connected yet. Until it is, write to the laboratory address listed above, or bring the report to any take-in counter.