This is one of Diamine's newest range of fountain pen inks, which aim to add a little sparkle to your writing. I've seen various pictures of this that make it look very gold, but that seems to generally be more the case when you plonk down lots of it. It's much more subtle coming out of my Lamy Logo.
No idea about waterproof/bulletproof properties, but I don't think you're really looking for that in this sort of ink. Might test it later.
My first attempt with this came out a bit more of a red brown, but that seems to be mainly down to lack of shaking. You need to shake this like a polaroid picture. And then a bit more. Still, quite nice for cards and so on, though I might not be using it at work.