Tophatter is luck of the draw. There are some decent sellers on the site, but as many have said, most of it is cheap Asian junk.
Now if you want some pretty jewelry, and don't care that it will tarnish, break, etc after wearing it awhile, then this site is for you.
Word of warning though, don't let the rush of being the Winning Bid make you overpay for this junk jewelry. It's very easy to get carried away.