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You're going to need something to that resembles a small gem to use as the nose stud, and glue to secure the nose stud in place. The stud can be made of jewels, beads, sequins, or anything with a tiny, flat surface. For the adhesive, fake eyelash glue is recommended, as it is soft and doesn't harm the skin. You can get these materials online or at any craft store. Avoid any glues that can be harmful to your skin, particularly super glues. These can be dangerous and cause harm.

Summary:
Purchase your supplies.