Laboratory
Gem Certification & Assurance Lab (GCAL)
New York, United States
Diamonds
GCAL (Gem Certification & Assurance Lab) is a diamond grading laboratory in New York serving US retailers.
What it does
Diamond grading reports, including detailed cut and light-performance analysis and optical imaging of the stone.
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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