Rings by Josef Koppmann The ring is hand forged of sterling silver and the topaz is set in solid 24 carat gold. Features Primary Material : 24ct gold and silver One of a Kind : Yes Metal : 24ct gold and sterling silver Gems : topaz Hallmarked : Yes Cleaning InstructionsThe ring is best kept clean by rubbing and brushing it gently under running water with bicarbonate of soda.