Very nice Mark!!
To darken the turned rings you can hold some 20 gage wire
about a foot long with pliers at each end. Run the lathe and hold the wire into the
ring until it starts smoking. You now have a permanent darkened ring.
I made up ''handles'' for the wire. 2 dowels about 3/4''dia, 4'' long, drilled a small hole
and tied the wire into each one.