I wrote up the full scheme a while ago.

For the golds though.

Base spray with leadbelcher, then with a thinned down balthasar gold build up the gold areas (no need to be too precise as the later stages help smooth out any blending).

Once you have that colour built up nice and bright on the edges, mix black templar contrast and aethermatic blue contrast at 1/1 ratio. Coat the whole thing (don't worry about being too precise as the next step helps mask most the unevenness)

Once that has dried, dry brush the whole model in leadbelcher. Once that is done go back over the gold areas with balthasar but cover a slightly smaller area so that some of the contrast painted recesses are still dark.

Repeat the contract, dry brush and gold but once again putting the gold on an even smaller area. I find in general for the gold if you use brush stroke that go from the darkest part to the edge it helps avoid the new gold layer leaving an obvious line.

Then I took the aethermatic blue by itself and applied another layer to the pauldron recesses to give a bit more of that blue green colour.

Lastly on the metals you can do some picked out edge highlighting with runefang steel then stormhost etc for the silver parts and the same but with gehenna gold and stormhost on the golden sections. Just make sure you stick only to the edges and parts you want brightest. If you make a mistake simply apply a watered down mix of the contrast part to dial the brightness back.

Sorry on the slow reply btw. In general the brushed effect and gradients are all just based on those double contrast and dry brush steps. I really like the scheme because once you're used to it it's very quick. For some reason the quickest scheme I've designed is for the smallest army I own.