I've used and been happy with Visions In Gold in Wheat Ridge. (Not sure what part of town you're in) He's quoted me a rather high price for a stone recut, but he reset my little yellow diamond for a very reasonable price - just a new head. What jeweler's closing?
Oh, also Rocky Mountain Gems (I think that's the name now - it was changed a while back) in Arvada. A friend has used J. Albrecht in the Louisville/Superior area, but I'm not sure how 'reasonable' he is. Does beautiful work tho.