As opposed to eating rings, which can permanently give you the associated magical intrinsics (without having to wear the ring). This, in turn, means that which

As opposed to eating rings, which can permanently give you the associated magical intrinsics (without having to wear the ring). This, in turn, means that which specific intrinsics you can get that way various from game to game (because you can temporarily polymorph into a metal-eating monster, but some rings are metal and others aren't). https://nethackwiki.com/wiki/Eating_jewelry https://nethackwiki.com/wiki/Eating_jewelry