What kind of information is on a GIA diamond report and what does it mean?

A GIA report contains a full scientific and unbiased assessment of your diamond’s 4Cs. GIA tests every diamond submitted to establish its authenticity as a diamond and whether it’s been subjected to treatments. GIA reports provide a full description of the diamond, including color, weight, measurements, and cutting style, and will disclose any known treatments.
Watch our video tutorial, which highlights the features and benefits found on a GIA report, and what that means for you and your diamond.

How to Read A GIA Diamond Report

Related FAQs

Does GIA certify or appraise diamonds and other gemstones?

GIA does not certify or appraise any material submitted for analysis. GIA reports (not certificates) offer technical information on the dimensions, quality and identifying characteristics of a diamond and value may be determined from this information; however, no appraisal value is stated.

Useful contact information if you’re looking for a professional to value your gem or jewelry item.

Do you grade branded specialty cuts?

GIA grades all polished diamonds regardless of shape or brand. However, we are only able to issue a cut grade for a D-to-Z color standard round brilliant diamond.

Is there a cut grading system for fancy shaped diamonds?

An internationally accepted system for visually evaluating the appearance of fancy-cut diamonds does not exist at this time.  At GIA, research is underway to develop the basic concepts for designing and implementing such a system.

Do you grade filled diamonds?

GIA does not grade filled diamonds. Since filling a diamond with glass is not a stable, permanent treatment, grading results would be affected if the filler is damaged or removed.

How is diamond carat weight rounded?

Diamonds are weighed to the thousandth (.001) of a carat (ct) and then rounded to the nearest hundredth (.01). The weight will only be rounded up to the nearest hundredth if the thousandth digit is a nine. For example, a stone that weighs 1.768 ct would be rounded to 1.76 ct, but one that weighs 1.769 ct would be rounded to 1.77 ct.