Where is the iron ring that you have to get to complete Grimgnaw's quest?

assuming you mean chapter one, I missed it too!
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Someone else mentioned it was in the no-mans land just before the blacklake distric, inside a house. Not confirmed by me personally, yet.

it is found on a female zombie that attacks you in a house in the beggars nest....said and done.

It's a "silver ring" with a slightly different icon than generic ones. You have to examine it to read the name of the elf.

it is in the last house before the gates tot he blackwood district in the no-man's land, it's kind of recessed back so you may have to look for it.