Maria Avillez Jewellery jewelry is made of 925 sterling silver with rhodium plating, 925 sterling silver with 24-karat gold plating, and 19-karat gold, meeting all quality criteria and duly certified by the Inquest Office of INCM - Imprensa Nacional Casa da Moeda (National Mint). The application of hallmarks is mandatory on silver pieces weighing more than 2 grams and on gold pieces weighing more than 0.5 grams. Learn about the legal hallmarks of the Portuguese assay offices here . Gold and silver prices are updated daily and can be consulted here .