In The Lord of the Rings: The Fellowship of the Ring (2001), Sauron can be seen holding a dagger in his left hand during the prologue. This is a remnant of a sequence that would have shown him creating the Ring in which he stabs his palm, letting his blood mix with molten gold.
Source: this video, coming from the DVD special features, showcasing an early version of the prologue. Many of these scenes were filmed, but cut down substantially in the final product.
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Not sure how it lines up with the books but that would have been so cool to see in the movies.

The second image looks like Sauron is performing dark magic for Reddit upvotes
Eww. Creepy