Diamond Reports

The IGI Diamond Report is essentially a statement attesting to the authenticity of a diamond and provides a reliable and accurate report of its identity and grade based on an internationally recognized system. Each diamond is scientifically analyzed by several gemologists who use their experience in combination with state-of-the-art equipment to produce an accurate description of the characteristics of the diamond and the quality of its cut. With its detailed information presented in understandable language, the different qualities of a diamond can be truly appreciated.

The grade or quality of a diamond is based on four characteristics commonly referred to as the 4Cs: the Carat weight, Color, Clarity, and Cut. These are analyzed and the results are recorded in the IGI Diamond Report.

Diamond Report

This big, full-page report, containing all report details, a diamond diagram, and unique security features, comes in slightly different sizes, depending on the IGI location where it was issued: United States: 8.5" x 11" (218mm x 278mm) and elsewhere: 210mm x 290mm (8.25" x 11.4").

Diamond ID Report

This report will include a full analysis of grading. The diamond is LaserscribedSM with the report number on the girdle and a scanned image of the inscription is included on the report. It measures 3.5" x 5.8" (87mm x 122mm). View Diamond ID

Diamond Consultation

The stone undergoes a series of analysis encompassing the 4Cs. Graduate gemologists working independently from each other test each stone. Although full analysis is performed and kept on record, the consultation includes color and clarity grading, diagram of the diamond's inclusions, measurements and a report number. The report holder will have the ability to upgrade to a detailed diamond grading report upon request.

Colored Diamond Grading Report

This report provides authentication of a diamond's natural fancy color, as well as a complete analysis of the diamond's 4Cs. With the emergence of sophisticated treatments and processes, this report has become a necessity.

Diamond Report in Credit Card Format

This report format with rounded corners - 3.4" x 2.2" (86mm x 54mm) - offers the option of a plasticized report, adding to the security features and standard report data as well as the high resistance to wear of a common credit card. View Diamond Report in Credit Card Format

Cut Grade Reports

Cut Grade Diamond Report

The quality of a diamond's cut may be the most important of the 4Cs. The cut quality directly influences the brilliance, fire and scintillation that make diamonds uniquely beautiful. In addition to the quality of the cut affecting the diamond's beauty, it also relates to the diamond's durability and practicality for use in jewelry. The cut grade system is designed principally to quantify the quality of the cut according to its affect on beauty.

The purpose for having a cut grade for polished diamonds is to establish a set of criteria that results in an evaluation process that is consistent, reproducible and easily understood by the public.

The quality of a diamond's cut is determined by the interplay of a number of factors, which are difficult to assess individually. As such, IGI provides a gemologically-based assessment of the diamond and issues a composite grade to communicate the overall quality of the diamond's cut.

Ideal and Excellent Cut Report

The ideal cut of a round brilliant cut diamond is striking in its precision and bears an unmistakable witness to the skill and care of the cutter. Diamonds meeting these criteria have less weight retention from symmetrical rough, and require extra time and care to produce the high quality finish.

Diamonds with this cut grade are rare and normally cost more than stones of comparable weight, color and clarity. An ideal/excellent cut diamond is polished to such perfection that the balance between brilliance and dispersion is superlative. The best combination of angles and proportion percentages as well as the highest quality of polish and symmetry allow for optimal light return.

Hearts and Arrows Diamond Report

IGI's Hearts and Arrows Diamond Report assures one that the quality of the diamond's cut conforms to an excellent set of criteria. The diamond polisher's technique consists of extremely precise angles in combination with very specific facet lengths and widths. These special cut stones are known to display a visual pattern of eight hearts when viewed through the pavilion (bottom) of the diamond, and eight arrows when viewed through the table (top) of the stones using IGI's Hearts and Arrows Scope.

IGI's Hearts and Arrows Report will assure you that your diamond meets the requirements for the top cut grade, polish, proportion and symmetry to maximize the brilliance, dispersion and scintillation visible in diamonds.

Colored Stone Report

IGI laboratories are equipped with the most technologically advanced instruments for the identification and authentication of colored stones. These instruments include immersion cells, micrometers, spectroscopes, polariscopes, refractometers, specific gravity liquids, binocular microscopes and spectrophotometers.

Techniques such as stone coating, diffusion treatment, heat treatment, polymer impregnation and clarity enhancement as well as sophisticated developments in creating synthetic gems, are commonplace today.

IGI's approach to colored stone analysis is extremely important to you, especially in light of the fast-evolving new techniques being used to alter and treat rubies, sapphires, emeralds and other stones.

Colored Stone Identification Report

The colored stone identification report identifies the gemstone's specific variety, shape and cut, carat weight, measurements, color quality and transparency factor, as well as other major optical characteristics. Disclosure of treatments is also noted in this report. Upon request, country of origin may be determined. The certificate clearly states if the stone is natural or synthetic.


Consumers worldwide rely on the International Gemological Institute (IGI) reports as the authoritative word on gemstone quality. They turn to IGI for its strict impartiality and its adherence to the international grading standards. You may wonder how a worldwide organization like IGI can ensure the consistency and reliability of its reports throughout the world.

Regardless of location, all IGI Laboratories operate under a set of core principles designed to protect the objectivity and accuracy of every report issued. These principles are supported by research, highly trained staff, state-of-the-art security and monitoring features and a host of best practices. Here are some of the ways IGI puts its operating principles into action:


All diamonds Ė and all customers Ė are treated equally. Regardless of the size, origin or ownership, each diamond undergoes the same rigorous testing and grading procedures as do all others. IGI adheres to its strict security guidelines and ďProfessional Ethics Policy and Code of ConductĒ. There is no preferential treatment for the diamonds, the owners or origin of submission.


Anonymity ensures the most objective grading results possible. IGI upholds these principles as follows:

  • After verifying all items submitted by a client, each diamond is placed in a unique storage facility inter-office envelope (IO) and the owner references are removed.
  • The IO is assigned a bar-coded label with a unique internal identification number that tracks the submitted stones through the grading process.
  • The Inventory Control Department at each IGI Laboratory serves as the control of operations. Diamonds are distributed randomly to and from this department between grading steps. It is not possible to predict who will grade any diamond.
  • An IGI report from any individual laboratory looks the same as any other report of its type, regardless of the location that generates it. As the report will likely be printed by the location that completes the grading process although, the content may come from multiple IGI locations.

Consistency and Accuracy

IGI continues to invest heavily in research, professional staff, training and quality assurance systems at all of its lab locations in order to deliver the most accurate and consistent assessments of a gemstones identification and quality.

  • IGI maintains rigorous calibration standards for all laboratory instrumentation. Depending on the instrument, frequent calibrations are performed to maintain consistent results.
  • Every article submitted for grading is tested and screened at various stages during the grading process and every IGI Laboratory follows the same screening policies and procedures.
  • A worldwide database captures hundreds of data entries for each and every diamond during the grading process. Providing IGI researchers with the data to detect new treatment trends gives IGI the ability to pinpoint a diamondís precise location during the grading process; and at the same time monitors the graders performance.
  • Master Comparison Stones that represent international diamond-grading standards are used in every IGI laboratory. Through the use of the Master comparison Stones IGI is able to track the uniformity of its practices.
  • IGIís quality assurance team representing IGIís most experienced graders and highest-ranking management regularly rotate to IGI locations worldwide to train staff and ensure adherence to consistent practices.

Security, Integrity

IGI vigorously monitors its grading standards worldwide to protect and insure against any breach in conduct or security. Clients and employees may anonymously report any suspected cases of misconduct, by way of contacting IGI.

  • IGI is audited annually by an independent, third party in three countries, in order to assure that the IGI laboratory and its personnel maintain its professional code of conduct and internal security systems.
  • IGIís database, a permanent repository of information on every diamond graded by IGI, is also a resource used to track a lost or stolen diamond and/or report.
  • Every IGI employee around the world is required to abide by the IGIís Code of Conduct and Professional Ethics Policy, which is designed to protect against conflicts of interest. This zero-tolerance policy prohibits the acceptance of gifts from clients and vendors.

Diamond buyers and sellers, jewelers and gemstone enthusiasts have counted on IGI for more than 35 years. IGIís grading standards and central core principles remain our focus of attention as IGI continues to expand worldwide. IGIís mission continues to uphold the highest of grading and identification standards and integrity.

For more information about IGI Laboratories around the world, visit www.igiworldwide.com or our Contact Us page.

Diamond Reports

Diamond Report

Diamond ID Report

Diamond Consultation

Colored Diamond Grading Report

Diamond Report in Credit Card Format

Cut Grade Reports

Ideal and Excellent Cut Report

Heart and Arrows Diamond Report

Colored Stone Reports

IGI's Grading Standard

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