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HRd certificates for loose diamonds explained

HRD Diamond Certification

Our review of HRD diamond certification.

HRD's mission is to develop Antwerp as a world diamond center by representing the diamond sector in Belgium and abroad to public governments and diamond organizations. Furthermore, they also strive to increase industry knowledge by conducting thorough research in manufacturing and trade efficiency.

HRD logo

Brief History of HRD 

HRD stands for Hoge Raad voor Diamant, which translates into the Diamond High Council. HRD Antwerp was created as an alternative to the Gemological Institute of America in 1973. Although originally it had other functions, today it focuses on Certifying diamonds according to internationally accepted standards.

Learn more about the diamond reports issued by the HRD below.

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HRD Diamond Grading Standards

Diamonds are analyzed by several expert gemologists using state-of-the-art laboratory equipment. Many gemologists must agree on the collective quality of a diamond before a grading consensus is reached. To ensure adherence to stringent standards, senior gemologists randomly monitor grading results for accuracy and consistency.

  • Diamond Weight or Carat

    Diamonds will be weighed on very precise scales ( up to 1 ten thousandths of a carat ! ). The diamond will be measured by state of the art measuring scanning machines in order to ensure maximum accuracy.

  • Diamond Color

    The Color of a Diamond is graded on a color scale from Exceptional White to Tinted White. Each nomenclature on the color scale has a corresponding 'letter' color, ranging from D to Z. 

  • Diamond Clarity

    The Clarity of the diamond ranges from Loupe Clean ( Internally Flawless ) to P 3 ( Imperfect ). This is based on purity, brightness and location of the internal and external characteristics. All the inclusions and imperfections will be carefully plotted on a skeleton diagram.

  • Diamond Proportions

    The Cut grade of the diamond ( or proportions ) is graded from Excellent, Very Good, Good to Unusual. Here a combination of the diamonds' girdle thickness, culet size, table width, crown height and pavilion depth are taken into consideration.

  • Finish Grade

    A diamond's Finish Grade is determined on a scale ranging from Very Good to Poor. This rating is based on the quality of the workmanship of the diamond polisher.

  • Diamond's Origin

    With Origin, the diamond is investigated thoroughly in order to determine if it is Natural or Lab Grown or some kind of imitation


The HRD Antwerp Diamond Certificate, offered for all diamonds, certifies the stone as a genuine diamond. It also contains a detailed quality description based on the 4C's (cut, clarity, color, and carat) and includes a plotted diagram.

HRD Diamond Identification Report

The Diamond Identification Report, offered for diamonds measuring up to one carat, is a compact document that contains the same detailed information noted in the Diamond Certificate, without a plotted diagram.





Further diamond education

Our diamond education pages help you to understand the 4 C's of diamond quality so you can choose your next diamond wisely.

Learn more about : the 4 C's of diamond quality - The different diamond shapes - Diamond certification

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