It's actually very simple.  Put your jewelry in a drawer :)

Lauren
________
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Put up some large objects or one big object that makes it so he can't
sit up there. After a while, he just won't. Antoher thought is to move
the jewelry.

Karen

Put your jewelry up. It's much more humane than leaving it out to tempt him,
then spraying him in the face.

Sherry

Give it up. Put away the jewelry. You aren't going to win this game.
He now knows how to get your undivided attention. :)  

BarB

You can't keep him off of your dresser; he's a cat?  There is very little you
can do to keep from doing anything he likes; he's a cat.  I suggest getting him
a cat tree, a large one, and/or a tree with cat ornaments.  Get him something
he'll enjoy more than your dresser.  Preferably, higher than your dresser.
Then, sit back and enjoy the show.

Move your jewelry.

Put your jewelry away where he cannot get to it.  Put 4-6 mousetraps,
set, upside-down on the dresser.  Cover them with a few layers of
newspaper.  When he jumps up there - SNAP! - he will be scared off,
and probably won't do it again.  Reset the traps each night for a week
or so.

-L.

Remove the cat toys (jewlery) or lock him out of the bedroom.

Keep your jewelry in a box.  :)

Any other solution requires a decent amount of time and energy. If
you're willing to do that, find a behavioral solution with conditioning.
Put stuff on the dresser he doesn't like, such as noisemakers (they are
like covered mousetraps so kitty can't get hurt - pet stores sell them
to deter dogs from going in the garbage), penny cans, Sticky Paws,
aluminum foil, a scat mat, and/or orange rinds (cats HATE them). Make
sure you correct him when you catch him by saying NO firm (not loud)
then showing him something he CAN do, such as go on his cat tree or a
window ledge, then praise him.
Breaking a behavior that he does when you're not around or sleeping
requires a bit of ingenuity - you have to convince him that he doesn't
WANT to go up there or he'll just do it when you're not around to "get"
him.
You have to give him something else to do as well - if he's doing it
because he's bored, take the jewelry off and bring his cat tree in the
bedroom with a couple toys. Soon, he'll choose his tree because it's
more fun.

Most of us don't have the time or patience to chase our cats off things
they find cool and interesting, so we simply remove whatever the cat
finds cool and interesting and the cat doesn't go there anymore.

Ok.. i did not try this yet but.......

I've been told to use orange based furniture polish (or other orange based
products) to keep the cats out of the Xmas tree .
the theory is that the cat (his cat at least) hates the smell and will stay
away from it.

Now i cant guarantee that it will work, but you can try different stuff
until you find something you cant dont like.