Lesser rings

From Tolkien Gateway
File:Lesser ring.jpg
"Lesser Ring", as portrayed by Larry Forcella for MECCG

The lesser rings were forged by the elves as essays in the craft of ring making. Gandalf mentioned these rings to Frodo when recounting the origins of the Rings of Power.[1]

Portrayal in adaptations

1995-1997: Middle-earth Collectible Card Game

Several cards describing and depicting lesser rings were released, for example "The Oracle's Ring", "Wizard's Ring", and "Magic Rings" of different power (lore, stealth, courage, etc.).

2007: The Lord of the Rings Online:

Narchuil was one of the lesser rings forged by the elven-smiths. It was worn by Amarthiel.
Saruman forged a lesser ring in his attempt to forge a Ring of power. His knowledge of the craft of ring-making  was incomplete however, and so the power it had may not have even amounted to the power of a true lesser ring crafted by the elven-smiths. Whatever power Saruman's ring possessed would have faded when the One ring was destroyed since it was still based on the original craft of Sauron. 

References