Cinereplicas Harry Potter - Nagini

At least 15% of the sale price of this piece of jewelry goes to the Lumos Foundation, a nonprofit organization founded by J.K. Rowling, which advocates for disadvantaged children and young people in care.

A charm bracelet may seem like a small, worthless item. But what other piece of jewelry is so deeply connected to memories and emotions? Why are these little masterpieces called "charms" if not to hint at their talismanic qualities? They hold a significance that goes beyond that of a simple piece of jewelry. They are true personal amulets.

Lumos is a spell I created in Harry Potter to bring light to a hopelessly dark and frightening place. At Lumos, we do just that: we bring to the forefront the left-behind, forgotten, and hidden children, so that everyone understands their situation and works hand in hand to help them out.

• J.K. Rowling, Founder and Chair of Lumos.