Other magic Rings?

[Raynor]

"There are many magic rings in this world, Frodo Baggins, and none of them should be taken lightly"

I think that the closest to this is found in the Shadow of the past:

The lesser rings were only essays in the craft before it was full-grown, and to the Elven-smiths they were but trifles – yet still to my mind dangerous for mortals.

What other sorts of magic rings (or other artifacts) existed in ME, and where did they come from?

Drugs and dwarves too made magic objects (pukel men - and the doors of Moria, the spells the dwarves put on the treasure they burried in Hobbit, or that nice verse - the dwarves of yore made mighty spells, while hammers fell).