Those of us on this side of the pond, however, should go with jewelry. Garner's Modern American Usage (cue angelic chorus) and Mr. Rewrite's other expensive reference books confirm it as the American English version.
Fortunately, Mr. Rewrite has an old shot of a sign misspelling jewelry without British English as its excuse:
And here's a link to the dozens of Google News items misspelling jewelry as jewelery.
Mission accomplished. Now it's time to get back to work.