Picked up my fiancee engagement ring from the designer yesterday, bought it from GOG loose, regret not having it set by them originally. I had a heck of a time finding a B&M to set it, another story at another time. I had the stone set in a 6 prong (platinum) prongs and 18K white gold shank. After taking it home I pulled out my 20x magnifying glass and went to the bathroom to secretly examine the work. Can only imagine what my girl was thinking locking myself in the bathroom all evening. But after examining the ring more closely I noticed the the shank says 18K PLAT, I''m guessing the shank is 18K white gold plated? Is that typical of 18K white gold rings to be plated? I also can''t find the GIA inscription on my stone, I''m guessing it''s being hidden by the prongs or could the inscription been removed during the mounting process?