Our jewels are always accompanied by personalized authenticity certifications with the description of the main characteristics, such as the kind of precious gems used, their weight in carats, the title and the weight of gold.
In order to guarantee the high quality of products that fit with the world's best jewelers standards, we exclusively use 18 Karat Gold with an alloy title of 750/°°°, or Sterling Silver with an alloy title of 925/°°°, or pure fine platinum.
The precious metal content of each piece is confirmed by the official gold hallmarks. Alex Jona hallmark 404TO guarantees the origin of the product.
For any purchased jewel featuring diamonds weighing more than 0.30 carats, we provide a certificate of authenticity issued by internationally renowned gemological institutes, in order to guarantee their authenticity. The certificate contains a detailed description of the diamond's characteristics and its grade of quality.
Best Diamond and Gem Certification
Some of the most renowned laboratories and gemological institutes for the certification of the gems are the following ones:
Gemological Institute of America (GIA)
The GIA is the biggest institute for the certification of diamonds in the world. All the certifications are of high quality and widely recognized.
Hoge Raad voor Diamant (HRD)
The Belgian institute is the biggest European diamond certification institute. The quality of the certifications corresponds to those of GIA.
International Institute of Gemology (IGI)
The Belgian Institute headquartered in Antwerp is represented by 16 offices and is now one of the largest and accredited diamond certification institutes.
Ethics & Provenance
We source high quality diamonds mined only from countries that are participants in the United Nations Kimberley Process Certification Scheme, which requires participating countries to control the export and import of all rough diamonds. We go beyond these measures, trying to determine where a gemstone was cut and polished.
Alex Jona is committed to basing its business on fair and transparent trading. The vast majority of Alex Jona jewelry is hand crafted locally, paying living wages to a highly skilled workforce so as to ensure that all the people involved in the making of your piece were given a fair deal.
We source gemstones around the world since 1960, knowing personally the people with whom we trade, establishing relationships with stone dealers based on fair and mutual trust. All precious stones used other than diamonds, such as sapphires, rubies and emeralds, are personally selected with equal care.