HRD Antwerp is excited to announce our new grading services for Stars, Melees & Minus 2. Meet us at Istanbul Jewelry Show to learn more.
• Show Dates: October 1–4, 2025
• Location: Istanbul Expo Center, Yeşilköy Mah, 34149 Bakırköy/Istanbul-Türkiye
An HRD Antwerp Natural Diamond Grading Report is an objective report that confirms a polished natural diamond’s authenticity and provides a detailed description of its key characteristics, the so- called 4Cs: Carat, Colour, Clarity and Cut.
When registered in our lab, your diamond or jewellery will be thoroughly examined by our graders and will undergo the following steps:
The weight of a diamond is expressed in carats. One carat equals 0.2 grams or 100 points, which indicates the size. HRD Antwerp has extremely accurate scales that measure up to five figures after the decimal point.
The first step is to determine if your diamond is natural, laboratory-grown or treated. If a diamond does not pass the initial test, it will be directed to our research department to further determine its nature.
Your diamond is accurately measured in millimetres as mentioned below: minimum diameter – maximum diameter in mm x height in mm (example: 6.44 – 6.47 mm x 4.04 mm)
The fluorescence grade under long wave is mentioned in the report. For the “Natural Diamond Colour Grading Report” the fluorescence grade under short wave is also mentioned.
Most diamonds range in colour from colourless (‘D’) to tinted colour (‘Z’). The colour grade is determined by comparison with a series of master stones, the best grade being D.
All natural diamonds have traces of their growth history, which determines the diamond’s purity. In most gem-quality diamonds, these are minor internal characteristics or inclusions. The very best and rarest stones are graded ‘loupe clean’ or 'LC'.
A diamond’s cut is essential to its beauty and is a combination of craftsmanship and scientific knowledge. The right proportions, symmetry and polish create internal reflections that maximise a stone’s sparkle, brilliance and fire.
Take advantage of our additional services to add value to your diamond. For more information and prices, please consult our price lists or contact our helpdesk via e-mail: diamondlab@hrdantwerp.com or +32 3 222 06 25
Hearts & Arrows diamonds are precisely cut round brilliants that, when examined using a special viewer, display eight hearts through the pavilion of the diamond (from below) and eight arrows through the crown of the diamond (from above). The appearance of the pattern is a strong indicator of a top-quality cut.
o inscribe diamonds with lasers, HRD Antwerp uses high-quality excimer shortwave technology. It cannot be seen with the naked eye and consequently does not affect the diamond’s physical appearance or value. Laser inscription can either be used to match your diamond and its corresponding grading report or to customise your diamond with a personalised message or logo.
Sealing guarantees that an issued grading report and the corresponding diamond belong together, and it keeps the diamond safe from oil and dirt. The HRD Antwerp sealing is tamper-proof.
Every diamond is tested to determine whether it is natural. If it is found to be laboratory grown, under disclosed conditions, we will issue a Laboratory Grown Diamond Grading Report, with this clear wording on the cover. The presence of the laser inscription is mentioned on the Grading Report, including a reference number and statement that the diamond has been laboratory grown. The same nomenclature as in a Natural Diamond Grading Report is used, with a detailed description of the 4Cs.
When registered in our lab, your diamond or jewellery will be thoroughly examined by our graders and will undergo the following steps:
The weight of a diamond is expressed in carats. One carat equals 0.2 grams or 100 points, which indicates the size. HRD Antwerp has extremely accurate scales that measure up to five figures after the decimal point.
The first step is to determine if your diamond is natural, laboratory-grown or treated. If a diamond does not pass the initial test, it will be directed to our research department to further determine its nature.
Take advantage of our additional services to add value to your diamond. For more information and prices, please consult our price lists or contact our helpdesk via e-mail: diamondlab@hrdantwerp.com or +32 3 222 06 25
Our laboratory has the knowledge and instruments needed to thoroughly analyse your jewellery. An HRD Antwerp Jewellery Report is an official document in which a jewellery item is authenticated for different purposes, such as insurance, inheritance or purchase. It can also be used to determine the market value of a jewel. These reports provide a general description of the jewel, the diamonds it contains and the precious metals of which it is made.
When registered in our lab, your diamond or jewellery will be thoroughly examined by our graders and will undergo the following steps:
The weight of a diamond is expressed in carats. One carat equals 0.2 grams or 100 points, which indicates the size. HRD Antwerp has extremely accurate scales that measure up to five figures after the decimal point.
The first step is to determine if your diamond is natural, laboratory-grown or treated. If a diamond does not pass the initial test, it will be directed to our research department to further determine its nature.
Take advantage of our additional services to add value to your diamond. For more information and prices, please consult our price lists or contact our helpdesk via e-mail: diamondlab@hrdantwerp.com or +32 3 222 06 25
This grading report mentions the colour origin of your diamond and describes its colour characteristics, as well as its short- and long-wave luminescence.
When registered in our lab, your diamond or jewellery will be thoroughly examined by our graders and will undergo the following steps:
Take advantage of our additional services to add value to your diamond. For more information and prices, please consult our price lists or contact our helpdesk via e-mail: diamondlab@hrdantwerp.com or +32 3 222 06 25
A special, pared-down grading report exclusively for diamonds under 1.00 ct.
Our laboratory has the knowledge and instruments needed to thoroughly analyse your jewellery.Every diamond of the jewellery piece is tested to determine whether it is natural or laboratory grown. If all diamonds set in the jewellery piece are found to be Laboratory Grown, under disclosed conditions, we will issue a Laboratory Grown Diamond Jewellery Report, with this clear wording on the cover. This report provides a general description of the jewellery, the laboratory grown diamonds it contains and the precious metals of which it is made.
A compact version of the jewellery report is available exclusively for jewellery containing less than 1.00 ct of diamonds (total weight)
Our online KYC client registration makes it easy for you to register as a client and submit your diamonds and jewels.
If you are a diamond seller or retailer who wishes to personalize your grading reportS, The HRD Tailored Grading Programme offers endless possibilities when it comes to co-branding. We liste the most popular options below, and we are always happy to discuss any new ideas you might have.
All of our diamond grading reports can be personalised with a logo of your choice.
A custom diamond drawing can be implemented on the grading report in accordance with your specific shape
A specific shape name can be shown on the grading report, which refers to shapes that are registered or patented.
For more information about necessary registration documents and licenses, please contact the lab location where you have registered.
