This is an officially licensed Lord of the Rings Gandalf Brooch, as seen in The Two Towers and The Return of the King, after the return of Gandalf the White. This clasp has a simple pin backing, and as such probably isn't strong enough to hold closed a heavy fabric cloak. It works best to cover a smaller, stronger clasp, like a simple hook and eye closure.

This clasp is costume grade, meaning that it is not sterling silver or another precious metal.