I''m new to this and need some information. I plan on resizing a engagement which of course has the diamond set on it. It is currently at a size 4.5 but I need it to be a size 5. If I take it out to one of these diamond places to resize it, do they need to take off my diamond? I wouldn''t feel to good about the diamond being taking off during the resizing or can they resize the ring larger w/o taking off the diamond? It''s a plantnum band and the diamond is 1 ct. exactely.