J.K. Rowling has designed a charm bracelet that is set to fetch over $30,000 dollars at auction next week. Sotheby's in London will put the charm bracelet, along with a first edition signed copy of The Cuckoo's Calling (signed, in fact by both Robert Galbraith and J.K. Rowling) and a complete set of 7 wood engrained Harry Potter prints up for auction on December 10th.

The bracelet is called the "Lumos Maxima" and has 11 charms inspired by the Harry Potter series. A sterling silver bracelet accented with gold, diamonds and precious gems, the one-of-a-kind piece includes Harry's scar, his glasses, the sorting hat, the symbol of the Deathly Hallows and more. Even better, the bracelet's closure is a wand!

Photo: Sotheby's

The only piece not directly from the Harry Potter series is a butterfly charm (said to be the most precious with amethysts and moonstones) -- the symbol of Lumos, Rowling's charity that she founded in 2005. All proceeds from the auction of the bracelet will go towards Lumos, and the auction house thinks it will earn upwards of £15,000-£20,000.

Photo: Sotheby's

Lumos is an organization that supports children across the world. Their mission: "No child should be denied a family life because they are poor, disabled or from an ethnic minority. Lumos works to support the 8 million children in institutions worldwide to regain their right to a family life and to end the institutionalisation of children." You can learn more about Lumos and how to help here.