What is the ideal cognac glass? Different opinions are as old as the drink itself. Riedel's Vinum cognac glass is shaped to showcase the key features of quality cognac: aroma, taste and colour. The flute-shaped glass allows a very small evaporation surface, delicately balancing aromas reminiscent of a summer meadow.Riedel Vinum Cognac Stemware, Set of 2-Home