How do I choose GIA certified diamonds

A diamond certificate, also known as a diamond dossier or diamond assessment report, is an assessment that has been drawn up by an independent, recognized institute. The diamond is checked by a team of gemologists or diamond experts according to various criteria set worldwide. In addition to the expert eyes, special magnifying glasses, microscopes and other devices such as absorption spectroscopes are used.

A diamond report, or certificate for short, contains a complete evaluation based on the criteria of shape, carat weight (Carat), color (color), clarity (clarity), polish (polish), symmetry and fluorescence as well as the external dimensions of the diamond . The certificates for round diamonds (brilliant-cut diamonds) also regularly include an assessment of the cut. In addition, the type of inclusions (clarity characteristics) and other, more in-depth information about the examined diamond are documented. In the case of larger diamonds weighing 1 carat or more, the position of the inclusions is often shown graphically (especially with GIA and HRD reports).

A certificate is an independent, neutral and professional assessment of a diamond, which shows the quality and thus also the value of the diamond and thus objectively ensures the value even in the event of resale. Therefore, Yorxs recommends that you only purchase diamonds with a diamond certificate from GIA, HRD, AGS or IGI. However, certification only makes sense for stones with a carat weight of 0.23 carats or more, as the costs for certification are no longer in proportion with smaller stones.

Take a look at the certificates. Find out about the certificates and their ratings while you are looking for and selecting your diamond. Because at Yorxs you can view the individual certificate for each diamond on the website before you buy a stone.
If, contrary to expectations, a certificate is not available or accessible, please contact us at any time. Our specialist advisors are also available to you at any time.

There are a large number of certification institutes and organizations around the world. In addition, there are also so-called "jeweler certificates", which are issued by the sellers - mostly jewelers - themselves. While these “jewelery certificates” have no objectifiable value in trade, especially when reselling, and are therefore not certificates in the sense of this definition, the certificates of the various independent certification bodies differ mainly in their accuracy in interpreting the uniform evaluation criteria. Yorxs therefore only offers you diamonds with certificates from certification institutes that enjoy the highest reputation. We therefore deliberately exclude certificates from some institutes, even if they are strongly represented on the market. Experience has shown there that the volatility in compliance with the evaluation criteria is too great and therefore unacceptable from the investor / buyer point of view.

Our motivation for this is simple: We want to ensure for you that every evaluation that shows a certificate enclosed with the stone also withstands a later review by the strictest and best examiners.

GIA Diamond Grading Report & GIA Diamond Dossier
GIA was founded in 1931 and is certainly the best known and most respected institute in the world today. This non-commercial organization prepares precise reports and interprets the evaluation criteria most strictly. Diamonds with a GIA certificate therefore have the greatest value retention. When buying, it should be noted that diamonds certified by GIA usually achieve the highest prices. Because of these facts, the certificate is particularly suitable for investment diamonds.

HRD Diamond Certificate & HRD Identification Report
Diamonds with certificates from HRD, an Antwerp-based certification institute, are particularly widespread in Europe. HRD's certificates are highly recognized as they are accurate and rigorous in evaluating diamonds. The institute is practically the European equivalent of GIA. Compared to GIA, HRD tends to rate somewhat more strictly in the upper range of the color scale and somewhat less strictly in the lower range. HRD diamonds are therefore sometimes a little cheaper.

The (Platinum) Diamond Quality Document & The Diamond Quality Certificate / Report

This US American, internationally recognized certification laboratory produces reliable analyzes, is trustworthy and impartial. The certificate is not widely used in Europe. AGS has developed its own, quite high standards for the 4 Cs in diamonds. Diamonds are rated on a scale from 0 to 10. 0 is the best rating. A diamond that was rated with a 0 cut is considered an "AGS Ideal Cut".

IGI Diamond Report

IGI is a European laboratory headquartered in Antwerp. The institute is one of the oldest and largest certification bodies in the world. IGI certificates can be assumed to rate diamonds higher than GIA or HRD - this means that in borderline cases they tend to choose the better rating. Because of its efficient organization, the institute is particularly valued by wholesalers. These two factors mean that IGI stones are sometimes cheaper. Yorxs decided to no longer offer IGI certified diamonds, since the color and grade rating of these diamonds - at GIA and HRD - is rated at least one level lower.

EGL operates laboratories at all major diamond production and trading locations around the world. In contrast to GIA or HRD, the evaluation criteria are interpreted in different degrees by the individual EGL laboratories. The Israeli laboratory in particular shows the most generous interpretation of the evaluation criteria. This can result in diamonds graded in Israel being two to three grades above a GIA rating. Although widespread, the certificate does not meet the requirements for transparency and comparability of Yorxs. Therefore, diamonds with this certificate are not offered by Yorxs. This approach was recently confirmed by RapNet, as RapNet has not accepted EGL certificates since October 2014 for this reason.

The diamond certificate lists the characteristics of the diamond. An independent gemologist can check whether the diamond and the certificate belong together using the criteria. In addition, most of the diamonds offered by Yorxs have a laser inscription in the diamond's girdle. This is only visible with a trained eye under 20x magnification. However, the enrollment clearly assigns the respective certificate to the diamond. Until recently, the diamond left the certification body in a so-called blister pack. However, wholesalers usually opened them when trading in diamonds. On November 3rd, 2014, GIA announced that diamonds will no longer be blistered. GIA offers to check diamonds in still sealed blister packs.