Scarlet Pimpernel Ring; Where?

After reading and watching the book/movie, The Scarlet Pimpernel (the 1982 version) I would love to know where to purchase Percy's ring. The ring percy has is the one that jeweled, and it turns to have a scarlet pimpernel on one side. So if you happen to know where I could purchase one, or have any ideas what so ever, it would be greatly appreciated :) thanks!