Wedding ring

No, not yet (although I'm going to be an eid kiddushin on Sunday, which started my thought process).

The reason why a ring used for kiddushin is traditionally (halachically?) made of simple gold with no adornment is so that the woman would easily know the value of the ring, to avoid the possibility of mekach ta'us [kiddushin, actually, but typing the more accurate phrase was causing me problems in Blogger, for some reason] if she's mistaken about the value of a gem attached to the ring. This makes a lot of sense during the olden days, when currency was worth its weight in the metal under consideration - the woman can see the ring and know that the ring is worth that volume of gold. Nowadays, though, she would not necessarily know the value of gold in dollars. Do we care about this? Would it be worthwhile to look up the value of gold beforehand in dollars (and, of course, the density of gold), so that she's under no delusions as to the ring's value? If all that would be needed is for her to acquiesce to the kiddushin for anything more than a p'ruta, why the hakpada against an ornamented ring?

This assumes that the value of the ring is equivalent to a chunk of gold of the equivalent weight. Do we, then, not account for the cost of the labor of the goldsmith?