The Ring of Saruman?

[The Saucepan Man]

Originally Posted by Findegil

At least the forging of a ring of power was considered as a sin, an act against rule of nature that Ilúvatar had made.

But doesn't it therefore follow from that that Celebrimbor and the Mírdain sinned against Eru's law in making the Three Elven Rings?

They were corrupted by Sauron, and that led to the tainting of the Seven and the Nine. But the Three were used for good.