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You got that right! See here: http://www.etymonline.com/index.php?term=cosmos&allowed_in_frame=0 (This is one of my favorite sites.)
"Jewelry is a singular collective noun. Whether a person is wearing one piece of jewelry or a dozen is irrelevant; jewelry is the word to use either way. Its plural is jewelries, but most writers would use the phrase pieces of jewelry instead."
(Pieces of jewelry has been added now.)