Smaragd is a designation of ripeness for dry wines used exclusively by members of the Vinea Wachau. The wines must have minimum alcohol of 12.5%. The grapes are hand-harvested, typically in October and November, and are sent directly to press where they spontaneously ferment in stainless-steel tanks.

Klaus sits adjacent to Achleiten and is one of the Wachau’s most famous vineyards for Riesling. The vineyard is incredibly steep with a gradient of 77% at its steepest point. The southeast-facing terraced vineyard of dark migmatite-amphibolite and paragneiss produces a tightly wound and powerful wine. The parcel belonging to Toni Bodenstein was planted in 1952.