Earrings by Josef Koppmann These earrings are handmade with sterling silver overlaid by 24ct gold with opals. There is a silver stud fitting at the back. Features Primary Material : 24ct gold and silver Other Materials : opals Fitting Type : Post Dimensions (mm) : 30x10x3 One of a Kind : Yes Metal : 24ct gold and silver Gems : opals Hallmarked : Yes Wire Material : silver Cleaning InstructionsThe earrings are best kept clean by rubbing and brushing gently under running water with bicarbonate of soda. Do not submerge in water for long periods.