Steinfeder, Federspiel und Smaragd can be produced from from quality white wines, as long as these wines originate from the Wachau wine-growing region and are being produced by a member of the Vinea Wachau wine-growers association. Absolutely no chemical-change processes or taste altering changes are permitted.
The credo of Vinea Wachau is to classify our quality wines into the three categories of: Steinfeder, Federspiel and Smaragd. These wines are considered ambassadors of the Austrian white wine culture - and especially of the World Cultural Heritage region Wachau. Not only are the three designations unique in Austria, but a similar classification cannot be found anywhere else throughout Europe.
Most importantly, the designations serve as an orientation structure for wine lovers, because it allows for dry wines to be defined according to three weight classes, each of which is based on natural alcohol content.