The Gem State in the Rockies (5)

I believe the answer is:

idaho

(Other definitions for idaho that I've seen before include "part of US near Washington" , "Another state" , "State of north-west USA" , "US state in the Rocky Mountains" , "North-western state of America" .)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.