You have inner glitter. Here’s your outer.
First thing's first: Here's how to do an ombre effect with loose nail glitter. You can do it on the tips of your nails, or from the bottom up.
Full instructions at The Beauty Department.
Applying all-over glitter is shockingly simple.
Just apply a coat of clear and dip your nails. For a raw look, don't even do a clear topcoat!
One way to do a gradient effect is to make your base ombre (using your normal nail polish) and apply a coat or two of glitter over the nail.