If you wish to know the location of one and then wish it to be brought to you. there's no guarantee that the wearer of said ring won't come with it and boy would it be mad. 

Quote from CBMoate >>

Wish doesn't allow you to create magic items, so RAW, nah son. Unless you know an 8th level spell that you can replicate that creates rings of wishes, but I haven't seen that one.

 No it does, you can wish for ANYTHING with varying levels of success
your following the wishes that have a 100% chance of success not all wishes.
people gotta realize that you can wish for anything except wishes, not just the things mention

Imagine ten of these, one each finger.

30 Wishes.

DM can cast 9th level counter spell at will, and has infinite reactions.

Imagine having one for each finger.

Quote from Rexir2 >>

My party had gone to the feywild to acquire a magic item to aid them in stopping the BBEG from taking over the multiverse. They met with an elder archfey, the Lady of Unending Dusk. After explaining their reason for being in her presence and beseeching her for aid, she conjures the bard's beloved instrument (his bond) to his hand, saying he must sacrifice it to her.

Reluctantly, the bard handed it over to her. As she stared at him with her black-scleraed, firey-irised eyes, she crushed it in the palm of her hand (she was large-sized) , fire erupting from between her fingers.

She opened her hand and blew away the powdered ashes, revealing a tiny, metalic object, a ring of three wishes. She warned him that the soul of his instument resides in the ring, and using it would inevitably destroy it.

Mechanically, the first wish would deal him 1d20 psychic damage from causing injury to the ring. The second, half his hit dice in d20s. The final one would do his entire hit dice in d20s for killing his beloved instument, possibly killing him from heartbreak.

The ring was needed twice before the final encounter with the BBEG. The party was mostly down and dying, and the bard was out of spell slots. The bard's player scrunched up his character sheet and said, "I cast wish, using the ring." The table went silent. The bard raised his ringed hand towards the heavens and declared, "I wish for one more chance! A chance to save my friends!"

The party woke up in a white void. The bard was on his knees, crying, while a woman knelt next to him. Both of them were ethereal. She gently raised his face, told him that it's alright, she understands and that she forgives him. She turns to the party and informs them that they should ready themselves to fight.

Using the wish, the woman then cast mass heal, restoring the party to full health, and I gave them back their levels in spell slots (not exceeding 5th level).

As the bard and his beloved faded to the afterlife, the rest of the party were sent back to the fight, refreshed enough to finish off the BBEG.

 That was amazing and beautiful. I hope it worked out for the party in the end.

"I wish for a ring of wishes!"
The ring disappears from your finger, than reappears. Congratulations, you found the location of A ring of wishes, not a different one

sadly true polymorph is a 9th level spell so you cant wish for that

How much should a spent ring of wishes sell for or cost? I imagine it would still be a well made ring of precious metal with precious gems.

Damn... What a way to go out... Respect.

Quote from Skytzro >>

Nah, son. You are wrong. you can wish for a magic item. Check out this quote from the wish spell description: "Similarly, wishing for a legendary magic item or artifact might instantly transport you to the presence of the item's current owner." By RAW, you can not only wish for a magic item, but you can wish for a magic item of legendary or artifact status. 

Also note that technically, casting a spell through a Ring of Three Wishes is still casting the spell, thus the stress clause would still be triggered if you tried wishing for something that's not on the menu. So in addition to having your strength drained, etc. you would have a 1 in 3 chance of never being able to cast wish again. You could get your Ring of Three Wishes and still end up not be able to use it (of course, you could give it to an ally or whatever).

If I wanted to be mild in my "punishment" of a player who recklessly tried wishing for another Ring of Three Wishes, I would trigger the stress clause and give them another Ring of Three Wishes, but with only a single charge remaining. It'd hurt but it wouldn't even necessarily be a strictly bad outcome, since moving a wish charge from one ring to a second ring could have some tactical value.

If you suffer stress from the wish spell and can't cast wish again, can you still use the ring? And do you suffer that stress if you use the ring to cast wish to do something beyond an 8th level spell?

Write down a list of ~~demands~~ things you want, and then wish for the things on the paper to come true. 

I wished for a item my dm created its called death gun its very op but I made it more op by asking for inf charges but u can do this whit any charged item 

I banished all things I encounterd 

I made my airheaded halfling to use the first wish to remove a log.

Can you use the last wish to restore charges to an item...

very powerful

Quote from CBMoate >>

Of course you can do that. But you can’t create a magic item with it RAW. If you wish for a ring of 3 wishes, the ring will vanish and then teleport into your hands. Congrats, you have one fewer charge!  Better luck next time. 

Also, per RAW the DM can just say “nothing happens” if your wish goes outside the specified allowable effects. 

 

 ....yeah no, you can legitimately wish for anything, and even create anything with it, it might just have a very low chance of success

or for one to teleport to you, or travel to you, like accio

To make is a bit less powerful, you can tell your party that 1 or 2 of the wishes have already been consumed when they come into possession of the ring.