Diamond Reports

A Gemological Certificate, also known as a Diamond Report, provides a comprehensive analysis of a diamond’s characteristics and quality. It includes detailed information about the diamond’s cut, color, clarity, carat weight, and other key attributes. This report is typically issued by a reputable gemological laboratory and serves as an unbiased assessment of the diamond’s value and authenticity.

The three most acknowledged diamond reports are GIA, HRD and AGS. 

GIA Diamond Report

The GIA report refers to a diamond grading report issued by the Gemological Institute of America (GIA), one of the most respected and renowned gemological laboratories in the world. 

The GIA report provides a comprehensive analysis of a diamond’s characteristics and quality based on internationally recognized standards. It includes detailed information about the diamond 4Cs: cut, color, clarity, carat weight, and other key attributes. 

The report also contains a diagram of the diamond’s clarity characteristics and may include information about fluorescence, measurements, and proportions. The GIA report is highly regarded in the diamond industry and serves as a trusted and reliable source of information for consumers, retailers, and professionals involved in the diamond trade.

HRD Diamond Report

The HRD diamond report is a grading report issued by the HRD Antwerp, a well-established diamond grading and certification laboratory. 

HRD Antwerp, formerly known as the Hoge Raad voor Diamant (HRD), is a renowned diamond grading and certification laboratory based in Antwerp, Belgium. It is one of the most prestigious and respected diamond grading institutions globally, providing expert analysis, grading reports, and educational programs for the diamond industry. 


HRD Antwerp is known for its commitment to accuracy, expertise, and maintaining the highest standards of integrity in diamond grading and certification.

AGS Diamond Report

The AGS (American Gem Society) diamond report is a grading report issued by the American Gem Society Laboratories. It provides a detailed analysis of a diamond’s quality and characteristics based on their proprietary grading standards. 

AGS is a respected organization in the jewellery industry known for its high ethical standards, gemological research, and diamond grading services through the AGS Laboratories.

Understanding the Differences


The GIA, HRD, and AGS diamond reports are all well-known grading reports, but there are some differences between them:

  • Grading Standards: Each organization has its own grading standards, which may result in slightly different assessments of a diamond’s quality. While all three organizations consider the 4Cs (cut, color, clarity, and carat weight), there may be variations in how they evaluate and assign grades to these attributes.
  • Cut Grading: The GIA is known for introducing the internationally recognized cut grading system, providing an overall cut grade assessment. HRD focuses on providing detailed information about a diamond’s cut parameters without assigning an overall grade. AGS is also recognized for its precise cut grading system, which takes into account various factors to determine the cut grade of a diamond.
  • Brand Recognition: The GIA has a strong global reputation and its diamond grading reports are widely recognized and respected in the industry. HRD is highly regarded, particularly in Europe, while AGS has a solid reputation within the United States. The brand recognition and perception associated with each organization may vary depending on regional preferences.
  • Documentation and Details: The format and level of detail in the reports may differ among the organizations. Each report typically includes information about the diamond’s 4Cs, additional characteristics, diagrams, and sometimes fluorescence and measurements. The specific information provided and the presentation style may vary between reports.
  • Market Perception: The market perception and impact of each report may vary in different regions and among different consumers and retailers. GIA-graded diamonds often command a premium due to the brand’s strong reputation, while HRD and AGS reports may have their own market preferences and perceived value.

It’s important to note that all three organizations are reputable and widely recognized in the diamond industry. The choice of which report to rely on can depend on personal preferences, regional market dynamics, and specific requirements.