You can easily propagate the Black Rose by cutting a stem, allow it to dry, dip it in rooting hormone, let the stem seal or callous, and finally sticking them in well-draining potting soil. This method also works with the rosettes.
Also question is, how long does it take for aeonium cuttings to root?
Simply take a stem cutting and if you want to see it root, just set it aside and keep it in a dry location away from direct sunlight. You will see roots forming from the bottom of the stem after about two weeks. It really is that simple.