The beauty of the peony is represented in Franck Muller The Double Mystery™ Peony highlights the savoir-faire of master jewelers and combines technical innovation and mechanical complication. The romantic peonies flowers inspire the full collection with grace and elegance, they are both spectacular and fascinating. 662 white diamonds and precious colored stones form beautiful peonies on the revolving discs, for a total of 4.87 carats. The collection is entirely hand-set and holds the innovative time display system which has made the Double Mystery so successful. This invention represents the successful mastering of a technical challenge and it was patented in 1998.