Polymer clay in various colors
Nickel wire
Seed beads in various colors
Jewelry pliers

Optional Supplies
Clay tools

Use the polymer clay to mold into different charms such as different Horcruxes or Hogwarts items, making sure to add a loop at the top for stringing it onto the bracelet.
Harry Potter Charm Bracelet - Figure 1
Bake the charms according to the package directions.
Allow to cool.
Harry Potter Charm Bracelet - Figure 2
Measure the wire around your wrist, then use the jewelry pliers to cut it a little bigger than the finished bracelet needs to be.
Use the pliers to make a loop at one end of the cut wire.
Harry Potter Charm Bracelet - Figure 3
String the seed beads and charms in the desired order.
Harry Potter Charm Bracelet - Figure 4
Make another loop at the other end of the wire with the pliers, leaving a little opening for hooking the first loop.

Final Product
Harry Potter Charm Bracelet

lizzyrc's tutorial was submitted for The Leaky Cauldron Harry Potter Crafts' July 2010 Save Galleons! Why Buy It When You Can CRAFT It? contest, and was posted with permission.

Finding Hogwarts

The Leaky Cauldron is not associated with J.K. Rowling, Warner Bros., or any of the individuals or companies associated with producing and publishing Harry Potter books and films.