Treatment of nails before modeling or coating with gel-varnish is the guarantee of uniform application of polymer material, as well as the quality of the coating of the coating with a natural surface. Two-sided file White Rhombus has an easy-to-use form of an extended diamond with two different abrasive surfaces, fixed on a strong and flexible plastic base. The tool is designed to work with artificial nails (gel / acrylic) and effectively performs a number of works: sawing the surface of the accrued nail, correcting the length, cutting off excess material or unevenness of the modeled plate. The average rigidity of the abrasive allows the sawmill to be quickly removed for gel-varnish coating. Abrasive particles form a dense layer of the working surface, resistant to erasure, so the saw has a long service life.