Katie: were you after a simple 1.8mm plain 6 prong setting? I was checking out American Set settings, and realized you could be interested in this
It says 0.25 to 2ct, and I chose palladium, but you can choose other metals too.
Some ladies here have purchased from this vendor and were pleased with the quality (plus very reasonably priced!), so I am considering buying from them too.
Hope it helps.