How to do gradient nails with a sponge by Cin-Cia Nail Academy (part 3). Put a top coat on where you want to put stones. Apply a top coat over the entire yellow on the bottom and apply the stones. Apply the top coat over to keep the stones in place. What you will need: stones, top coat Cin-Cia Nail academy was featured on various media outlets such as Sankei Shinbun(newspaper), Yahoo! News, Fuji TV because the school offers a unique program to help students start their very own nail salon.