Currently on trial is this beautiful purple gradient glass nail file.
Glass nail files are becoming increasingly popular due to their eco-friendly materials. Despite their hard texture, they are extremely delicate to your nails, unlike some harsh emery boards. Even though they are made of glass, they will not smash or splinter, and their smooth edges make them safe. They help minimise chipping, seals the tip of the nail after filing, and leaves your nails feeling super smooth.
Works well on both real and artificial nails.