Yeah, I used a blue glaze on the sword and it's dulled it down. I think I probably need to go over the brightest parts again. Also got some advice from the GW store manager about using a thinner wash as the base on the red areas to help the blue lit areas fade more naturally, still, all things considered, it's not a bad second effort.
You probably could paint like this, I spent a lot of time with trial and error, but I plan to put some step by step guides up for things like gemstones and what have you. They're easier than they look, small ones can be a bit of a faff but chunky gem stones are easy once you know how.