I'm in a "crunchy" crowd, many of whom have bought pre-loved jewelry from pawn shops, or re-used their parents'/grandparents' to use for their own engagement. What they wear looks good from a distance, but I never have an opportunity to inspect things closely. For those of you who have pre-loved jewelry, especially diamond rings, what does it take to refurbish both the diamond and setting? How "new" can it look?