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Certificates and jewellery passport, on request

When purchasing a diamond, it is important to pay attention to its certificate.
It is proof of the qualities of a diamond. It therefore contains information about the cut shape, carat, clarity grade, colour tone and masses. An independent and renowned gemstone laboratory should issue a diamond certificate. It serves as a guarantee that the dealer's information about the quality of the diamond is correct. This document is important because a layperson is usually not able to recognise the characteristics and criteria of a cut diamond.
It also establishes whether the diamond is genuine and of natural origin and whether any artificial enhancement of quality has been used.

An internationally recognised, trustworthy certificate guarantees that your individual diamond of choice has been tested by independent gemologists and that the information is correct.


Every diamond over 0.3 carat is delivered by Diamanthaus with an original certificate from GIA.

Low quality diamonds can also be certified with a corresponding certificate, which defines the characteristics neutrally and in writing. Therefore, a certificate does not automatically mean that it is a "good" diamond.

There are numerous certificates on the market, not all of which can be indifferently regarded as good or representative. Therefore, it is important for you as a customer to know which ones they are. 
All certificates have a number. With most laboratories it is possible to check this online as well as by laser on the diamond. This engraving is only visible with a strong magnifying glass, which affects the quality.

In the case of coloured diamonds, there are also certificates that provide an accurate assessment of the colour of the diamond. The most important point here is that this proves that the colour is of natural origin.


However, such certificates often do not include many other details, such as the purity of the diamond.



We analyse and interpret the scientific properties of gemstones. We share this information with our clients and the dealers in our Gemological Reports. In addition, we share our knowledge with an academic audience in publications as well as in presentations in scientific journals. We also publish our findings in magazines and newspapers for gem trade professionals, dealers and a wider audience.

Such a gemmological report costs between CHF 99 and CHF 2500, depending on the type of gemstone, its carat weight as well as the processing time. More comprehensive reports for entire pieces of jewellery may be more expensive.

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