Assay Office Marks

Mandatory information on Portuguese Assay Office (INCM) legal marks.

Portuguese law (Decree-Law 98/2015) requires that buyers may contact the Assay Office to verify hallmark authenticity.

Precious metal articles must bear responsibility and assay marks. For verification: contrastarias@incm.pt.

Official marks chart

Portuguese Assay Office legal marks chart
Source: Contrastaria Portuguesa
MetalSymbolFineness (‰)
GoldRam999, 916, 800, 750, 585, 375
SilverRabbit999, 925, 835, 830, 800
PlatinumHummingbird999, 950, 900, 850
PalladiumLynx999, 950, 500