On the Certificate of Authenticity we describe the quality and the detailed specifications of the gem or jewelry. The Certificate of Authenticity is the "identity card" of your good.

The Certificates of Authenticity of jewelry and gemstones issued by Walter Leite's Laboratory meet the international standards and norms of gemology and are recognized by all international gemological entities.

The laboratory provides technical certification and appraisal for various segments involved directly or indirectly in the market for jewelry and gemstones, such as insurance companies, banks, pawnshops, law firms, judiciary, jewelers, auctioneers, antique dealers and individual customers.

Diamond Certificates
Internationally, the certification of diamonds is based on the 4Cs: Color, Clarity, Carat and Cut. These are the four main factors that determine the quality of a gemstone. The certificate of a diamond describes the features and proportions of the stone - which highlight its qualities. This eases the understanding between buyers and traders.

Colored Stone Certificates
Just like diamonds, colored gemstones (paraiba tourmalines, rubies, sapphires, alexandrites, emeralds, and others) require certificates of authenticity due to the large amount of syntheses and imitations that are on the market since the late nineteenth century.

The certificate ensures the authenticity and quality of gemstones, distinguishing the natural stones from synthetics and imitations.