Single-color glitter gradient nail art refers to a nail design technique where the color of glitter gradually transitions from one shade to another. This style is popular for its eye-catching and stylish appearance. It typically involves applying a base coat, followed by a layer of glitter polish that has a gradient effect. The gradient can be created using different techniques, such as layering different shades of glitter polish, using a sponge to blend colors, or using a special gradient brush.