LOTR: Is There A Secret Ring Of Power That The Others Don't Know About?

gamerant.com:

In the world of Lord of the Rings, there are 20 rings of power. Although not all of these rings actually appear in the books, or in Peter Jackson’s film adaptations, they are referred to throughout various Tolkien texts, and revealed to the audience in the form of Galadriel’s prologue, in which she recites the poem of the rings, explaining the 9 for men, the 7 for dwarves, the 3 for elves, and the one for Sauron himself. These rings all met various fates, being swallowed by dragons, returning to Sauron along with their masters, or being kept safe by powerful beings in Middle Earth such as Gandalf, Galadriel, and Elrond.

But it is possible that there is another ring of power that no one realizes is in existence? It does seem odd that Gandalf, the grey wizard, should have come into possession of such a rare and powerful object instead of Saruman the white, who is the highest of the order of wizards, and so a few people have noticed and pointed out that Saruman may have taken it upon himself to create his own ring of power, and in doing so, brought himself to the attention and inevitable corruption of the dark lord, ultimately ensuring his own downfall.

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These speculations come from the scene in which Gandalf rides to the tower of Orthanc to seek council with Saruman, and ask his advice about what to do with the one ring. As Saruman greets him at the door, Gandalf describes “he led me up to his high chamber. He wore a ring on his finger.” Now, this seems like a small and insignificant observation, there are many rings in Middle Earth that are not rings of power, but the fact that Gandalf mentioned it specifically, and noticed it enough to point it out in the first place