Sorry if someone else has said this, but i think the 21st ring of power (or what was to be) was not a ring of power at all. But Saruman wanted it to be. I quote the prefix to Lord of the Rings (Prefix? Preface? the introduction, or the bit before the introduction? Ah you know what i mean) as best as i can remember it:
Quote:
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Given time Saruman would have perfected his Lore of Ringmaking and made himself another ring of power
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"perfected" suggests he already had some skills, and maybe the ring on his finger was a failed attempt to make a contesting Ring of Power.