Dip a cotton swab in denatured alcohol and swab at the glue if you are not too concerned about potentially damaging the jewelry. The alcohol might take the glue off and it is relatively low risk as long as you rinse it off after you are done.
4
Soak your jewelry in a cup of acetone or nail polish remover if you really aren't worried about damaging it. The acetone should remove the glue, but it might wreck your jewelry too, depending upon what you kind of jewelry you are cleaning.