Some beads are so pretty you want to display one of them, or you might have small bead projects that you would like to wear. Either will work well as a set of stud earrings. Craft and bead stores sell earring posts that have a disc in front to which you glue your intended decoration. The posts come with backings, which are the small devices through which you push the post, in effect locking the earring in your ear lobe.
Dust off the bead. Clean off any smudges that you find.
Hold the bead up to the post. The disc that you will glue to the bead is flat and may stick out too much if you are using a small bead. Hold the two together to ensure you do not see a halo of post metal visible behind the bead. Earring posts come in different sizes; if you are using a smaller bead, look for earring posts that have smaller discs. Note that an extremely small bead, such as a seed bead that is only a couple of millimetres wide, is too small to use by itself if you do not want the post to show around it.
Sand the side of the disc that you are attaching to the bead. Sand it very lightly.
Place a drop of strong glue on the front of the disc.
Press the post onto the bead. Hold them together for however long the glue's manufacturer recommends. You do not have to hold them until the glue dries, just long enough so that the bead will not fall off the post when you let go.
Wipe away extra glue with the tissue.
Wait one day before wearing them or longer if the glue's manufacturer recommends it.
Test the stud and glue. Put on the earring along with the behind-the-ear backing. Pull the backing off and take out the earring. Try to hold the front portion of the earring by the area where the post attaches to the bead if possible, so you do not break the glue bond and yank the bead off the post.
If the bead is very heavy, it might cause the earring to sag forward. Use an oversized backing or special clear disc that is available at craft stores to add extra support, jeweller, Tom Weishaar, suggests in "Professional Jeweler Magazine". Push the backing or disc up so that it is against the back of your ear lobe. This essentially wedges your ear lobe between the front of the earring and the wider back.