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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
GCAL is a diamond research and identification laboratory:
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Research led by a
PhD in mineralogy
experienced in the detection and identification of
treatments and synthetics.
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Employs some of the
top experts
in the
diamond grading industry.
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Equipped with state-of-the-art technologies and instrumentation,
including the DTC DiamondSure, DTC DiamondView, FTIR Infrared
Spectrophotometer and Raman Spectrometer. Take our
virtual tour
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Located in New York's Diamond Tower at Fifth Avenue and
47
th
Street
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