We draw your attention to security measures related to the purchase of a precious stone. A number of dishonest merchants deliver stones that do not correspond to the certificates that accompany them.
If you are considering investing in a diamond, you require two guarantees on the part of any merchant : a laser-engraved certificate number (in the case of a diamond), as well as laboratory sealing of the stone (for all stones). The latter condition will enable you to detect a fraud without any possible doubt.
![sealed diamonds sealed diamonds](https://www.diamant-gems.com/wp-content/uploads/2015/11/diamants-sous-scelles.jpg)
Laser engraving is not to be overlooked. Once the stone is mounted in a piece of jewellery, you will be able to recognise your gem thanks to this engraving by using a simple magnifying glass (there is no need for a microscope). The certificate number must be preceded by the company logo of the laboratory that performed the appraisal, and of course, the certificate should mention the engraving.
![laser engraving of the diamond on the girdle laser engraving of the diamond on the girdle](https://www.diamant-gems.com/wp-content/uploads/2015/05/gravures-laser-diamant-rondiste.jpg)
![certificate and laser-engraving of a diamond certificate and laser-engraving of a diamond](https://www.diamant-gems.com/wp-content/uploads/2015/11/certificat-et-marquage-laser-diamant.jpg)
You will find all the information you need to confidently make your purchase by following the links of the only three laboratories recognised by the diamond trade :