9kt yellow gold Petit Damier diamond and malachite signet ring9kt yellow gold polished finish signet band malachite totalling 1. 60 carats grey diamonds totalling 0. 40 carats pav set diamonds Hallmarked in the United Kingdom at the London Assay Office. Normal everyday use and external agents may reduce the lustre of gemstones and gold surfaces. To maintain, use specific, non abrasive products specially meant for cleaning jewellery.