Amulet of unchanging
An amulet of unchanging prevents its wearer from changing into a different form.
The amulet prevents polymorph and other means of changing form, and also protects the wearer from sliming; any sliming in progress is aborted. It does not prevent being turned to stone. A lawful player who prays while in undead form will return to their normal form, even with the amulet.
If you eat the amulet, you are "un-changed" and revert to your normal form.
If you die while polymorphed and wearing an amulet of unchanging, you will not revert to your normal form, and will instead die.
If you polymorph into a wood or leather golem and get rotted away by a brown pudding, or if you polymorph into an iron golem and get rusted, you will resume your normal form. If you are polymorphed and decline to die in explore or wizard mode, you will also resume your normal form.
There is a 4.5% chance that a randomly-generated amulet will be an amulet of unchanging, making it the least generated amulet.
Because uncontrolled polymorphing and being slimed are both potentially dangerous if the amulet isn't unchanging, and losing all HP while polymorphed is lethal if it is unchanging, this is a relatively difficult amulet to identify safely.
The easiest way is probably to eat a mimic corpse while wearing the unidentified amulet. If you don't mimic gold or an orange, the amulet is unchanging. If you do, the amulet isn't unchanging, you won't break or fall out of your armor, and if a monster tries to pick you up, you return to normal form immediately.
If you're following the vegetarian or vegan conducts, an alternative would be to polymorph yourself while wearing the amulet and a ring of polymorph control, specifying a safe form if you do polymorph. If you intend to use a polytrap for this purpose, you must remove any source of magic resistance as well. If the amulet is unchanging, the polymorph trap will not disappear and you will receive the message, "You feel momentarily different."
If discovered early, this can be a good substitute for magic resistance in the early game, where polymorph traps are a big threat. Moreover, they can be used to permanently remain in a particular polymorph form. This is somewhat risky, of course, since you will die permanently if your HP is drained to zero, but can be useful if you lack a reusable source of polymorph. This can become a literal life-saver if you accidentally genocide your role or race while polymorphed. Also, if you are riding and do not have magic resistance, an amulet of unchanging will protect your steed from polymorph traps.
In UnNetHack, amulets of unchanging cannot be polymorphed.
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