One minute, I'll show you my attempt at jade. It needs a bit of adjustment but I will explain when I put the pic up.
Ok... these pics are really not helping my example... The flash looks a lot closer to the "real" paintjob. Here is a link for the type of jade I was shooting for, all in all I am pretty happy with the results.
http://www.justjade.co.nz/images/jade19.jpg
Here is a few more examples of pretty standard types of jade.
http://anthropologynet.files.wordpress.com/2007/11/the-jade-trade.jpg
Anyway, I used a basecoat of black for the model. Then I painted most of the armor with vallejo gunmetal blue(I think it is 70800... there are a lot of numbers on this bottle). After the gunmetal blue I put a mix of bleached bone with a tiny bit of bad moon yellow. When the paint dried I put a VERY thin layer of watered down gunmetal blue over the bleached bone and yellow. I chose to drybrush with
GW boltgun metal to give the model a more metallic feel.
Experiment with this, I will continue to try a few mixes at some point. Right now I would think making the first coat on the guns more yellow would have produced better results.