Certified Diamond Exchange-About GCAL
The Marketplace For GCAL Certified Diamonds
June 17, 2024
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About GCAL

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:

  1. Research led by a PhD in mineralogy experienced in the detection and identification of treatments and synthetics.
  2. Employs some of the top experts in the diamond grading industry.
  3. 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
  4. Located in New York's Diamond Tower at Fifth Avenue and 47 th Street