It has some blueish/greenish colored areas ,but I have no idea if that\'s turquoise or some tinted enamelHow should I clean the silver? Should I assume it\'s sterling silver? Does that make a difference? It\'s old and badly tarnished.thanks!Yeah you can use jewelry cleaner or do this: Cover the inside bottom of a heat-proof glass dish bowl with a piece of
aluminum foil, shiny side upPlace the tarnished silver in the bottom of the dish, on the
aluminum foilAdd 1 heaping tablespoon of baking soda, and then slowly pour boiling water to cover the pieceThe tarnish will gradually collect on the
aluminum foilRemove your silver, rinse thoroughly and dryIf you live near a jeweler, she/he can tell you if its turquoise and what sort of silver it is, before you even clean it.Other related question