The American Gem Society Laboratories (AGSL)

The American Gem Society is a non-profit trade association whose mission is "a dedication to proven ethics, gemological knowledge, and consumer protection." The AGS' Diamond Grading System rates Cut, Color, and Clarity on a scale of 0 through 10, with 0 being the rarest and most desirable and 10 being the least desirable.

Reports Provided:

  • DQ Document: their most comprehensive assessment of the various qualities of the diamond being evaluated.
  • Diamond Quality Report: a less comprehensive assessment.
  • Diamond Consultation
  • For more information on the AGSL please visit www.agslab.com

The Gemological Institute of America (GIA)

The GIA is an independent, non-profit organization that is renowned for its impartial service as the world's foremost authority in gemology. The GIA has set the standard for diamond grading and gemological identification.

Reports Provided:

  • GIA Diamond Grading Report
  • GIA Diamond Dossier
  • Diamond Consultation
  • For more information on the AGSL please visit www.agslab.com

Both reports describe different aspects of a diamond's quality. For more information on the GIA and its reports please visit www.gia.edu.

GCAL Diamond Certificate of Authenticity

GCAL warrants that each diamond meets (within recognized gemological tolerances) the grades and measurements noted in the GIA or AGSL grading report.


A written appraisal states the approximate retail replacement value of an item. This value reflects current market data and typical retail prices. The cut, color, clarity, and carat weight of the gemstone(s), the weight of precious metal included in the item, and the craftsmanship of the item all assist in the determination of the replacement value.

An appraisal ensures that in the case of loss, theft, or damage, your insurance company will give you the correct replacement value for your item. The more information contained in the appraisal, the better chance you have of receiving the exact replacement for that item. Your insurance agency can rely on this appraisal to calculate a coverage rate for your diamond or piece of fine jewelry. Appraisals should include photos and may include a plot of inclusions for stones 1 carat or larger.  Having photos of your jewelry helps a jeweler replace your piece accurately.

An appraisal is not the same as a buy offer or consignment  if you wish to sell your jewelry.  Resale values are lower than appraised values.