It changes every week and its a selection of two or three different dropped sets for Jewlery. Usually two as they also include a Monsters Helm/Shoulder combo or two.
I don't remember the exact prices but they are around 500,000. Less for a less desirable trait. Kind of expensive for 40 more of a stat and 3 more of a set bonus if you ask me. Something you would only notice on a calculator. Especially since Purple stuff sells for 100K on that Vendor