The word " Rhodium " comes from the precious metal Rhodium ( rarer and more expensive than gold ) . The silver Rhodium is a process used in jewelry that is to cover electroplated jewelry 925 silver with rhodium . Silver Rhodium is a precious material more expensive than the classic 925 . Grace rhodium , silver jewelry do not blacken . Cover jewelery in silver with rhodium is used primarily to prevent oxidation of the silver . A classic silver jewelry oxidizes in contact with the skin , clothes etc ... This process also makes silver jewelry a little more white and shiny.