1. Line a dish (glass or tupperware) with a sheet of aluminum foil. 2. Sprinkle baking soda on the aluminum foil3. Place silver on the aluminum foil (make sure it is in contact with the foil)4. Boil some water5. Once water is brought to a boil, pour it gently into the dish, pouring over the entire surface area of the dish, with enough water so that the silver piece is completely submerged6. Let it sit for 10-15 minutes7. Remove the piece from the dish and rinse to remove any residue from the baking sodaDepending on how tarnished your piece is, you may need to repeat the process.
(assuming the piece is silver- it looks copper or rose gold in the pics! good luck