I love purple and here is a simple gradient purple with shimmer.
Sinful Colors is an awesome brand they have lots of beautiful colors to choose from. I purchased Perfection "10" from Walmart. I love the iridescent shimmer.
To get the gradient effect I layered on SC Verbena the lighter color of the 2 purples. Then I used a makeup sponge applied both colors next to one another dabbed on nails until I was satisfied with the look. Lastly, added on one coat of Perfection 10, Power UP. It looks amazing I couldn't stop looking at my nails.
Have a great nail polish day!