This is a simple gradient design made using a textured nail polish for the base.
Firstly I painted all nails in 2 coats of a yellow textured nail polish. This particular shade also has some slight shimmer to it.
Then using a makeup sponge and a purple nail polish with a silky effect I added the gradient.
I built this up to the desired effect in layers by concentrating more of the nail polish at the tips of each nails.
The end result left texture to the whole nail, but as the purple was not a textured nail polish, it was as if the texture gradiented out towards the tips of the nails as well.