This is a stacked version of my "STHENO" septum ring, it's casted from an original I made by soldring two of the "STHENO" rings on top of each other.
My caster uses recycled sterling silver and the bronze he uses is 90% copper and 10% tin.
When I get the pieces back from the caster I file and sand them, lastly I put them in my tumbler machine to give them a smooth finish.
I have three versions, one in bronze, one in oxidized sterling silver and one in natural sterling silver.