Certification and Hallmarking

MRJOIAS Online’s pieces made in 835‰ silver, 925‰ silver, 9kt gold (375‰), 14kt gold (585‰), 18kt gold (750‰) and 19,2kt gold (800‰) are hallmarked, meeting all quality requirements, and certified by INCM (Imprensa Nacional Casa da Moeda). 

The application of assay office marks is mandatory for silver pieces that weigh more than 2 grams and gold pieces that weigh over 0,5 grams. In the case of silver pieces that weigh less than 2 grams or gold pieces that weigh less than 0,5 grams, only the application of contrast with the responsibility mark of the manufacturer or equivalent is mandatory.

Click here to find out about the Portuguese assay office marks.

INCM assay offices provide this assurance by checking the legal fineness (the proportion of precious metal in an alloy) and applying the hallmark alongside the responsibility mark, manufacturer’s mark or equivalent. In case of doubt about the authenticity of the marks, the buyer can request, for verification purposes, to the services of the INCM Assay Offices.


Economic Operator Data
Name: MRJOIAS Lda
Comercial Register: 502 150 050
Nº of Activity Title: T2928 (Retalhista de Ourivesaria - Meios de Comunicação à Distância)

To check the daily quotes for precious metals (gold, silver, platinum, and palladium), visit the website of the Portuguese Jewelry and Watchmaking Association here or the Bank of Portugal's website here