GCAL is the
diamond grading company
with a "Zero Tolerance" Consumer Grading Guarantee that provides
cash-back for any error in grading or identification of the certified
GCAL is a diamond research and identification laboratory:
Research led by a
PhD in mineralogy
experienced in the detection and identification of
treatments and synthetics.
Employs some of the
diamond grading industry.
Equipped with state-of-the-art technologies and instrumentation,
including the DTC DiamondSure, DTC DiamondView, FTIR Infrared
Spectrophotometer and Raman Spectrometer. Take our
Located in New York's Diamond Tower at Fifth Avenue and