Have your diamond certified by a gemological laboratory

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The gemological certificate, a true identity card for a diamond, emerged in the 1970s with the creation of the first certificate by the GIA (Gemological Institute of America). The aim was to certify the diamond's authenticity and to assess its quality through the 4Cs (cut, carat weight, color, and clarity). Since then, other internationally renowned gemological laboratories have adopted this system to certify diamonds. Do you own an uncertified diamond or are you planning to buy a diamond and want to get it certified? Discover how to proceed.
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Choosing a diamond certification body

Our customer service team is at your disposal free of charge for the appraisal of your jewel.

To certify your diamond, it is essential to contact an official organization. Otherwise, the certification obtained will have no value. Only a few gemological laboratories are authorized to issue certificates of authenticity. These laboratories are as follows:

• The Laboratoire Français de Gemmologie (LFG): this is the oldest gemological laboratory in the world (founded in 1929). It is the only French laboratory that offers gem and precious stone analyses with nearly 5,000 analysis reports per year. You can choose to have your diamond certified by the LFG because it has an exceptional gem collection that allows it to provide quality reports.
• The GIA (Gemological Institute of America): this is the best-known laboratory for diamond certification. It has developed a certification scale (International Diamond Grading System) adopted by many laboratories, based on the study of the 4Cs.
• The IGI (International Gemological Institute): it is the largest independent laboratory in the world and the first to offer sealed certified diamonds to ensure their protection. The IGI analyzes diamonds on the same scale as the GIA.
• The HRD (Hoge Raad voor Diamant): this Belgian gemological laboratory analyzes diamonds while keeping the owner's identity anonymous through a double code system.

Once you have chosen the gemological laboratory where you wish to have your diamond certified, contact them for information. You generally have two types of certifications to choose from: a full certification or a partial certification. The partial certification is cheaper and can already give you an insight into the diamond's authenticity and value.

The certification process will last from 24 hours to several weeks depending on the laboratory. Certifying your diamond will not only allow you to estimate its value and establish its authenticity, but it will also record the main characteristics of your stone, studied by expert gemologists:

• The shape and cut of the stone
• The cut quality (or proportions) of the diamond for the "round brilliant" cut
• The dimensions of the diamond (diameter, height, crown thickness, minimum and maximum diameter in millimeters)
• The carat weight of the diamond
• The clarity and color of the stone
• A diagram with inclusions if the diamond has any
• The symmetry, polish, and fluorescence of the stone

If the diamond has undergone any treatment regarding color or clarity, the gemological laboratory will indicate this during the diamond analysis.

Generally, the diamond will be laser-inscribed on the girdle with its certificate number, ensuring traceability. This marking does not harm the diamond's beauty as it is only visible under 10x or 15x magnification.

Which diamonds can be certified?

Before embarking on the certification of your precious stone, ask yourself the right questions. Is certification of your diamond possible or necessary? It is important to know, for example, that you cannot certify a set diamond. It is not recommended to certify very small or lower quality diamonds, as the cost of certification will be as high as the price of the stone!

However, if your diamond is of very good quality, it is highly advisable to have it certified. In the event of a resale, its value will increase significantly if it is certified.

What is a gemological certificate for a diamond?

A gemological certificate is a sort of identity card for a diamond, which appeared in the 1970s. It certifies the diamond's authenticity and assesses its quality through the 4Cs (cut, carat weight, color, and clarity).

Which laboratories are recognized for certifying a diamond?

Recognized laboratories include the Laboratoire Français de Gemmologie (LFG), the Gemological Institute of America (GIA), the International Gemological Institute (IGI), and the Hoge Raad voor Diamant (HRD).

How does the diamond certification process work?

After choosing a laboratory, the certification process can last from 24 hours to several weeks. It includes the analysis of the diamond's shape, cut, dimensions, weight, clarity, color, inclusions, symmetry, polish, and fluorescence.

What types of diamonds can be certified?

It is recommended to certify diamonds of good quality, especially if they are of significant size. Set diamonds generally cannot be certified, and it is not advisable to certify very small or lower quality diamonds.

How can Diamantaire Paris OG help with diamond certification?

Diamantaire Paris OG offers expertise in the field of high jewelry and can assist you in the appraisal, sale, or evaluation of your jewel. For more information, contact them at 01 48 87 23 37 or visit 43 rue Beaubourg, 75003 Paris.

Diamantaire Paris, recognized for its expertise in high jewelry, offers a full range of services for appraising, selling, or evaluating a Boucheron jewel. Our team of experts uses precise evaluation methods to ensure each piece receives a fair and accurate appraisal. For those looking to invest in precious stones, our page investing in a GIA diamond provides essential information for making informed decisions.

We understand the importance of every detail in jewel evaluation. That is why we also offer specialized services for appraising an Art Deco jewel. Our expertise extends to various high jewelry houses, including Repossi and Bulgari, offering expert appraisals for those looking to sell their luxury pieces.

For clients interested in selling contemporary jewelry, we also offer services for selling Fred jewelry. Our team is equipped to appraise and sell jewelry from all eras, including antique pieces. If you own historical jewelry and wish to sell it, our page selling an antique jewel will guide you through the process.

At Diamantaire Paris, we are committed to providing high-quality services to meet all your jewelry and diamond needs. Whether you are looking to sell, invest, or simply obtain an accurate appraisal, our team of experts is here to help you.