I just received a new sample TODAY from GMS which I think would suite your glitter request perfectly. It's called "Convex Diamond". It is about as glittery as you can need!!
I'll attach photos of the sample I received, but don't know if the photos will do the glitter justice. It really is very cool looking when it catches the light. It looks especially cool with the transparent foils!
I know its an old post, but do they still make this convex diamond ?