Earrings by Shivani The green tourmalines are set in 18k yellow gold with an 18k white gold surround. The gold has a soft satin finish. Features Primary Material : 18ct gold Fitting Type : Post Dimensions (mm) : 13 x 13 One of a Kind : Yes Metal : white gold 18ct and yellow gold 18ct Gems : tourmaline Hallmarked : Yes Wire Material : 18ct white gold Cleaning InstructionsUsing a soft toothbrush gently brush the piece in a solution of water mixed with bicarbonate of soda. Rinse well in running water.