A friend at work had a custom e-ring made several years ago in yellow gold. Now his wife wears a lot of silver (colored) jewelry and wants to know if there''s anything they can do short of having the ring remade to change the color. Can it be bleached or dyed or plated with another color metal (can you plate yellow gold with white gold? yellow gold with platinum?)? If not, can he have the yellow gold melted and colored and recast (provided his original jeweler still has the mold) so that at least he doesn''t lose the value of the gold in the ring?