Wachau, Austria. Legend. Momentary silence falls. Knoll is recognized. Some are emeralds - Wachau’s masterpieces. The green lizard on the bottle marks an “emerald”. These vintages are made only when everything is perfect in the sunny region. Everything. Emerald wines are never sold before the 1s t of May in the year following the harvest. Emerald Emmerich Knoll.