Begin wrapping the wire around the mandrel, in the center of the wire. Make these first wraps about a size and a half larger that your actual ring size. Make four wraps to the base of the ring.
Begin wrapping the wire around this center knot, wrapping underneath the last wrap.
Continue wrapping one piece of wire at a time, alternating which piece you are using every few wraps.
I find it helpful to start the rose off the mandrel, and then to put the ring back on for the last few wire wraps. When you have about 2" left of wire, make sure each piece is on the opposite side. Wrap the wire around the base of the ring three times.