Over the years I’ve become a big fan of Faber-Castell…
Diamine Shimmertastic Night Sky: Fountain Pen Ink Review
Night Sky is one of Diamine’s new range of shimmery inks and it’s quite a tasteful one. The sparkle isn’t too in your face and, against the dark ink, really does look like a pretty winter’s night sky (not an English night sky though – they’re usually very cloudy.)
You do need to use this ink with a wet broad nib to get the best out of it. The shimmer is there with finer nibs but only if you look closely.

Here I am doodling the picture.
This is one of the best of Diamine’s sparkly inks.