I'd forgotten about the coloured stones policy.
Kelinas, if you want to work with WF looks like you'll have to call in and see if a policy exception could be made for all three stones, whichever center you choose, and have an alternate plan if not.
I've decided to just redo my diamond setting and search for a new center stone for the 3 stone idea. My in-laws and dh are both getting irked at my lack of ring wearing, which I totally don't get. Overall, it's all very disappointing
I am looking at IDJ for my diamond reset. I think I'm going to stick with a plain shank with a small halo.
As for the 3 stone, I'm happily looking for a new center stone candidate.