This brings up another interesting point: was Saruman's ring,
if it had Power, under the dominion of the One?
Seems like the palantir was not the only thing he kept secret from the White Council...
New theory for Saruman's corruption: to find out how to best destroy the Ring, he wanted to find out how it wrked. To do that, he tried making one himself, sort-of succeeded, and -
...would be Nazgul#10 if he wasn't a maia, I guess...
And that's assuming that it was indeed a ring of power. The 21st.