One well-regarded brand is Benoit Serres Liqueur de Violette. However, it is reportedly very difficult to obtain even in France. Benoit Liqueur de Violette is made with a neutral spirit base with a smaller portion of Armagnac added to it.
After Crème de Violette had been all but unavailable in the United States for decades, in mid-2007 Haus Alpenz began importing the Rothman & Winter Crème de Violette, which is made from Queen Charlotte and March violet flowers from the Alps.
Crème de Violette is the forerunner to the liqueurs Parfait d'Amour and the American variation, Creme Yvette, both of which are decidedly different with pronounced vanilla and/or citrus flavors. When Crème de Violette is not available it is possible to use the Parfait Amour or Creme Yvette to replicate the violet color in a drink, though the taste profile is quite different.
It is considered a core ingredient in the Aviation cocktail