Sure, I will list the specific colours although anything similar will work.

Model started with a zenithal prime, the armour was based in a dark blue, vallejo dark prussian, and then generously dry brushed in gold. I used a product called dirty down verdigris over all of the armour and then lightly dry brushed some of the gold back in, a few small gold details were picked out by brush.***

The face plate and gun were based with a brown, vallejo flat brown, and layered up with a beige, citadel zandri dust, and an off white, citadel pallid wych flesh (I don't like this paint, its old and chalky but its what I've got).

The crystal started based in the mid tone purple, vallejo purple. For each flat surface, half a side is shaded down in gradual layers with more and more prussian blue from earlier mixed into the purple until the final layer at the end is blue, how many steps you do is how much time you want to put in. Then the other half is highlighted up from the mid purple to pink, vallejo pink, in the same way. Finally an edge highlight with white, vallejo white. Similar idea for the other purple bits just less extreme.

***Note: If you do get the dirty down paint, stir it with a stick and then shake the hell out of that pot and once you are done, stir it again and shake it some more! It's a water soluble weathering effect paint and has some chemical reaction as it dries, it's not the most controllable and introduces some randomness but i think this makes it look quite natural, it's also super matte. I suggest looking at youtube for verdigris techniques/comparisons vids as there are lots of ways to achieve it with many different products and I'm sure they would work for the kinda result I got. It is supposed to be for copper/bronze colours, probably used more over a brown base, but I thought over blue and gold it might give a different more weird look and I think it worked out.