Monique Lhuillier for Royal Doulton Atelier Wine Coaster and Stopper Set Coaster, Stopper Nickel-plate Atelier For all metals giftware, including sterling silver, silver-plated, nickel-plated and alternative metals, we recommend hand washing. Giftware should be hand washed with a mild detergent Do not use lemon-scented detergents. Do not use abrasive cleaners that can scratch and dull metal surface