I haven't had any restoration work done but I know that this jeweller does some really nice custom design work - and they seem to do anything. They are a family run business - Royal Jewellers in Andover - Paula Leed is one of the owners. It might be worth a call. Hope this helps. I know that this is north of Boston - but not too far! I'm not from Boston myself but have used them because of family who live in the area.
let me expand my inquiry: i would happily ship my items to a good person. I have some very high end antique pieces (platinum art deco etc) that need some work. I really need someone with expertise on restoring or repairing.