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.
- Located
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.
See Guarantee