Attach the crystal to one end of the wand using the jeweler’s wire. You’ll want to wrap it a few times to make sure it’s secure – it may help to add a dab of glue as well, although if you do so, you'll need to wait for it to dry before you begin wrapping the wire. The one in the photo was wrapped with a copper wire, because copper is a great conductor of physical energy, so we can assume it also conducts metaphysical energy well. In many cultures, copper is associated with the divine. You can use silver or other metals if you choose.
Once you’ve wrapped the crystal around the wand, secure the wire and tuck it in so there are no sharp poky edges.
You can add other items to your wand if you wish, such as beadwork or feathers. When you’re finished, consecrate it as you would any other magical tool.