Gem Certification and Assurance Lab (GCAL) is a diamond research and identification
laboratory specializing in guaranteed diamond grading:
- Employs some of the top experts in
the diamond grading industry.
- Equipped with state-of-the-art technologies and instrumentation, including the DTC
DiamondSure, DTC DiamondView and FTIR Infrared Spectrophotometer.
Take our virtual tour.
in New York’s diamond building
GCAL is the only diamond grading company with a "Zero Tolerance" Consumer Grading Guarantee that provides cash-back for any
error in grading or identification of the certified diamond.