Diamond Hardener Nail hardener with diamond dust 10ML Color: Size: Art. No. Description Powerful ingredient combination with Hexanal and diamond powder strengthen and harden nails, also making them shinier. Your nails receive an attractive, very shiny protective coat, grow faster and more beautiful. Thin, soft nails will take an end! Detailed information of the ingredients can be found here: ARTDECO makeup and ARTDECO care Application Apply a layer of the Diamond Hardener under the colored lacquer, or in layers as a natural nail lacquer with a high gloss effect.