Polished brass
Mother of pearl
Do not put in the dishwasher but wash by hand with lukewarm (no hot) water
Scrub, only the mother-of-pearl part, with a soft-bristled toothbrush so as not to scratch the surface.
Do not use harsh or abrasive cleaning agents (detergents, soaps or acidic liquids) for cleaning
Wipe dry with a cotton cloth.