18th birthday key charmA key charm is a popular gift to give on important birthdays as the 16th, 18th and 21st birthday. It symbolises opening doors for a brighter future. Made from Rhodium is a chemical element with symbol Rh and atomic number 45. It is a rare, silvery white, hard, corrosion resistant and chemically inert transition metal. It is a noble metal and a member of the platinum group. Silver is used for the trim, as well as the 18th symbol, the symbol has small