GIA: Laboratory: Services

The GIA Diamond Grading Report
Fine jewelers and auction houses consider the GIA Diamond Grading Report to be the world's premier gemological credential. The Institute uses the most advanced technology available to assess, to the fullest possible extent, the authenticity and quality of your diamond. A GIA Diamond Grading Report is issued for diamonds of all shapes and sizes that fall within the D-to-Z color grading scale, and provides the most comprehensive analysis of a diamond’s quality. A GIA Diamond Grading Report includes the Institute’s authoritative assessment of a diamond’s 4Cs – color, clarity, cut, and carat weight – along with a diagram of your diamond’s clarity characteristics.

The GIA Laboratory issues Diamond Grading Reports for loose, natural diamonds. GIA Diamond Grading Reports are not issued for synthetics, simulants, mounted diamonds, or diamonds that have undergone treatments that are considered unstable, such as fracture filling or coating. And while Diamond Grading Reports may be issued for diamonds that have been laser drilled or HPHT processed, these stable treatments are prominently disclosed on the report.

For a detailed look at a GIA Diamond Grading Report, click here.

The GIA Diamond Dossier®
The GIA Diamond Dossier is a grading report issued for diamonds within the GIA D-to-Z color grading scale that weigh less than 1.99 carat, but more than 0.15 carat. The Dossier includes GIA’s authoritative analysis of a diamond’s 4Cs – color, clarity, cut, and carat weight. As an added security benefit, the Dossier service includes a microscopic laser inscription of the Dossier’s identification number on the girdle of the diamond, connecting the diamond and the report together.

The GIA Laboratory issues the Diamond Dossier for loose, natural diamonds. Diamond Dossier is not issued for synthetics, simulants, mounted diamonds, diamonds that have undergone treatments that are considered unstable such as fracture filling or coating, or diamonds that have been HPHT processed. Any evidence of other treatment is prominently disclosed on the report.

For a detailed look at a GIA Diamond Dossier, click here.

The GIA Colored Diamond Grading Report
GIA’s D-to-Z color grading system for colorless to light yellow diamonds, is based on the relative absence of color. However, the grading system for a colored diamond is based on the presence of color. Using a controlled viewing and lighting environment and an elaborate set of color comparators, trained graders can consistently locate the characteristic color of a diamond and assign it a grade. The hue chosen is modified by a “Fancy-grade” term, such as Fancy Light, Fancy, Fancy Intense, Fancy Deep, Fancy Vivid, or Fancy Dark, which describes the range of the combined effect of tone and saturation. Once a color grade is established, the diamond is graded for clarity.

The GIA Colored Diamond Grading Report contains all the same grading information as the GIA Diamond Grading Report (without a cut grade). This service is provided only for loose, natural diamonds, and may be provided for those that have been artificially irradiated, laser drilled, or HPHT processed. These treatments are prominently disclosed on the report. The GIA Colored Diamond Grading Report is not issued for synthetics, simulants, mounted diamonds or diamonds with non-stable treatments, such as fracture-filled or coated diamonds.

Colored Diamond Identification and Origin Report
Both mounted and loose diamonds can be submitted for this service, which determines the nature of a diamond’s color, as well as its color grade. Using a controlled viewing and lighting environment and an elaborate set of color comparators, trained graders can consistently locate the characteristic color of a diamond and assign it a grade. The hue chosen is modified by a “Fancy-grade” term, such as Fancy Light, Fancy, Fancy Intense, Fancy Deep, Fancy Vivid, or Fancy Dark, which describes the range of the combined effect of tone and saturation. A clarity grade is not included with this report.

Gemological Identification Reports
In addition to its Diamond Grading Reports, GIA also provides Gemological Identification Reports for mounted or loose gems. These reports include the identification of the gem material, and any evidence of treatments detected in the process. For loose gemstones, measurements and weight will also be provided.

Laser Inscription
At your request, a diamond may be microscopically inscribed on its girdle with its unique GIA Report Number (referred to as the GIA Inscription Registry), a personal message, or other text, symbols or logos. The GIA Inscription Registry is included in the Diamond Dossier® service. An inscription allows for easy identification of a diamond, a way to personalize the diamond, or serves as a form of branding for the diamond manufacturer or retailer.

GIA Report Check
This free online service allows you to check the information contained in a GIA Diamond Grading Report and GIA Diamond Dossier®. Just enter the diamond’s report number and carat weight, Report Check returns all the grading information – including a cut grade when available – that was issued for that diamond. Report Check currently serves only those diamonds that were graded from January 1, 2000 to the present. To access report check, click here.

Facetware Cut Estimator
This free online service allows you to estimate a cut grade for any round brilliant cut diamond, simply by entering the diamond’s proportion and finish information. To learn more about Facetware, click here.

Report Verification Service
If you would like to confirm the authenticity of your GIA Diamond Grading Report or Diamond Dossier®, or the information your report contains, you can request a free verification. Simply submit your diamond along with its original report to the GIA Laboratory. The diamond will be re-assessed and the results of the new analysis will be returned to you, along with your diamond and its original report.

Anyone can submit gemstones to GIA for report verification. Although we attempt to perform this service even when diamonds are mounted, in some instances we may have to ask to have the diamond removed from the setting so our gemologists are able to properly perform the verification service. Please note that the results will be returned to you by letter, along with your diamond and its original report.

For more information about this free service, please contact GIA Laboratory Customer Service at 760-603-4500 ext. 7590 in California or 212-221-5858 ext. 3724 in New York; or e-mail labservice@gia.edu.