What Is an HRD Diamond Certificate — and Should You Trust It for Lab-Grown Diamonds?

Expert Breakdown: HRD Antwerp Diamond Certificates

What HRD Antwerp Is

HRD stands for Hoge Raad voor Diamant, Dutch for "Diamond High Council." Established in 1973 in Antwerp, Belgium, HRD was created as a collaboration between the Belgian government and the diamond industry to support and protect Antwerp's position as a global diamond trading center.

HRD Antwerp is one of Europe's leading independent diamond grading and certification laboratories, with strong historical ties to the European market and the Antwerp World Diamond Centre. The organization's grading reports are highly regarded within Europe, particularly in the Antwerp diamond district, one of the world's primary diamond trading hubs.

HRD has issued grading reports for lab-grown diamonds since 2013, using the same 4Cs terminology and grading structure applied to natural diamonds. However, in June 2025, HRD announced a significant policy change: from 2026 onward, the laboratory will discontinue grading certificates for loose lab-grown diamonds, with exceptions for research purposes or jewelry certification.

HRD Lab-Grown Diamond Grading Reports

HRD's official certification for lab-grown diamonds is called the "Laboratory Grown Diamond Grading Report." These reports use the same 4Cs nomenclature and grading terminology applied to natural diamond certificates, providing comprehensive quality assessment. The reports explicitly state that the diamond is laboratory-grown while maintaining the same grading structure used for natural stones.

With the 2026 policy change, HRD will focus primarily on natural diamond certification for loose stones, though lab-grown diamond grading will continue for mounted jewelry pieces through their Laboratory Grown Diamond Jewellery Report service. For buyers seeking certified lab-grown diamonds today, IGI and GIA remain the primary certification options for loose stones.

What HRD Certificates Include

HRD grading reports provide detailed documentation of diamond characteristics using the traditional 4Cs framework. For a full explanation of how these grades are evaluated, visit our Diamond Certificates & Grading Reports guide.

• Carat Weight: Measured using high-precision scales to determine the diamond's exact weight.
• Color: Graded using a range consistent with international standards, from D (colorless) through the color spectrum.
• Clarity: Detailed clarity grading with clarity plots and diagrams showing inclusion patterns in full grading reports.
• Cut: Evaluated through proportions, polish, and symmetry, with grades including Excellent, Very Good, Good, or Fair.
• Unique HRD report reference number
• Explicit statement identifying the diamond as laboratory-grown
• Fluorescence assessment
• Laser inscription details matching report numbers to stones
• Security features including tamper-proof sealing

HRD maintains digital copies of every report in its archive, typically for ten years, enabling long-term verification and reference.

How to Verify HRD Certificates

HRD certificate verification uses the official My HRD Antwerp portal. Visit my.hrdantwerp.com and enter the unique HRD report number from your certificate. The system displays the archived grading details matching the entered certificate number, confirming authenticity and consistency with the physical report.

Physical verification involves examining the laser inscription on the diamond's girdle under magnification using a jeweler's loupe or microscope. The inscription should match the HRD report number, confirming the certificate corresponds to the specific stone. HRD's sealed grading reports provide additional security through tamper-evident packaging that ensures correspondence between the report and the diamond.

HRD Report Types

• Natural Diamond Grading Report: Comprehensive 4Cs grading for natural diamonds with detailed measurements and clarity plotting.
• Laboratory Grown Diamond Grading Report: Uses the same 4Cs grading structure for lab-grown stones, explicitly identifying them as laboratory-grown. Note that from 2026, this service will be discontinued for loose stones.
• Natural Diamond Colour Grading Report: Specialized report focusing on color characteristics and assessment.
• Jewellery Reports: Certification for mounted pieces, detailing all diamonds and precious metals in the finished jewelry.
• Laboratory Grown Diamond Jewellery Report: Describes jewelry containing lab-grown stones — a service that will continue after the 2026 policy change.

HRD Grading Standards and Methodology

HRD's grading methodology uses internationally recognized 4Cs scales with precise measurement protocols. The laboratory emphasizes impartial assessment through double-coding systems designed to eliminate grading bias.

• Cut Grading: Evaluates proportions, polish, and symmetry using grades from Excellent through Fair, assessing how effectively the diamond interacts with light.
• Color Grading: Uses a range from D (colorless) through Z, consistent with international diamond grading standards.
• Clarity Grading: Employs multiple clarity grades from high clarity to included, with detailed plotting of internal characteristics.

Within Europe, HRD is often regarded as comparable to GIA in 4Cs grading precision and consistency. HRD's historical approach to lab-grown diamond certification used the same terminology and standards as natural diamond grading, distinguishing it from laboratories that employed different frameworks for synthetic stones. For a direct comparison of how HRD, GIA, and IGI approach lab-grown grading, see GIA vs HRD Diamond Certificates: Lab-Grown Diamond Grading Explained.

HRD's Market Position

HRD Antwerp holds a strong position in the European diamond industry, particularly within the Antwerp diamond district and among European wholesalers, retailers, and insurers. As part of the Antwerp World Diamond Centre network, HRD maintains deep operational ties to one of the world's primary diamond trading hubs.

Outside Europe, particularly in North American markets, GIA certification tends to be more widely recognized and influential. However, HRD-graded diamonds are accepted by appraisers and jewelers globally, with the laboratory's European reputation reflecting its historical role in the continental diamond trade.

HRD's 2026 policy change regarding lab-grown diamond certification reflects the organization's strategic emphasis on maintaining clear distinction between natural and synthetic stones, focusing resources on natural diamond grading while continuing to serve the lab-grown market through jewelry certification services. Understanding CVD vs HPHT growth method differences helps contextualize these certification approaches.

Accessing HRD Resources and Information

Official HRD resources provide comprehensive information about diamond grading and certification services. The main HRD Antwerp website at hrdantwerp.com serves as the primary portal for reports and laboratory services. Certificate verification and archived report access is available through the My HRD Antwerp portal at my.hrdantwerp.com. HRD also offers educational programs, including lab-grown diamond courses covering identification, grading, and gemological techniques.

Certification Resources at DEEVE

For a complete overview of diamond certification standards across all major laboratories, visit our Diamond Education Hub and Diamond Certificates & Grading Reports guide. You can also explore our individual certificate explainers:

• Understanding IGI Lab Grown Diamond Certificates
• Understanding GIA Lab-Grown Diamond Reports
• GIA vs HRD Diamond Certificates: Grading Explained
• CVD vs HPHT Diamond Growth Methods
• The Complete Lab-Grown Diamond Guide