This is the simplest necklace you'll ever make.
And I'm sorry about the quality of these pictures, I did this late at night with bad lighting and I tried to make them look as good as I could.
Leather or Buckskin cording
A chunk of crystal
First figure out where you want you necklace to hang and cut. It should be long enough to slip over you head, this necklace doesn't have a clasp.
Take one side of your cord and glue it to your crystal, do the same thing to the other side. Make sure it's some what symmetrical so it will hang properly.
Take another smaller piece of cord and glue it so you can wrap it around. Wrap around, glue, press, wait.
Make a bracelet while you're waiting for that to dry...
That's it! You're done, enjoy.