i noticed that about my tiffany silver as well. when i first received my jewlery from tiffany it was so shiny and now i have to polish it before it wear it. i store it in a pouch that's supposed to be tarnish free. most of my silver is so dull i dont even like to wear it out. i'm not sure why this is happening. i never wear it in the shower and i take good care of all my pieces. i'm even thinking of sending everything to get cleaned.