Starry sky nail art typically features designs that mimic a night sky filled with stars. These designs often incorporate shimmering glitters or diamond-like embellishments to create a sparkling effect. Nail artists use a variety of techniques to achieve this look, including freehand painting, stencils, and 3D nail art. Diamond nail art, on the other hand, specifically involves the use of diamond-shaped nail art stickers or real diamond dust for an elegant, luxurious finish.