New to Oliver Proudlock’s Serge DeNimes label? Think plenty of sterling silver, oxidised finishes and everyday stackable pieces, each telling their own unique story. The Traditional Hallmark ring is a smooth classic shaped band which is designed with five struck hallmarks - SDN (Serge DeNime sponsors mark) Lion (fineness mark), 925 (silver quality), Leopards Head (the mark of Goldsmith's Company Assay Office) and the year of marking.