Constant Diamond Mountain Vineyard was founded by Freddy and Mary Constant. The couple established Diamond Mountain Vineyard in 1993 when they bought a dilapidated but historic farmhouse high on Diamond Mountain. At 2121 feet above sea level, it may be the highest, or certainly one of the highest, vineyards in the region. The couple had backgrounds as radio station entrepreneurs but their plan on Diamond Mountain was to grow and sell grapes to winemakers. However with the 1995 vintage they started making very small amounts of Cabernet Sauvignon under their own label and by 1999 Wine Spectator wrote that Constant was “a new can’t miss Cabernet…this vineyard is able to produce stunning wines on a consistent basis.” Constant produces very small amounts of Cabernet Sauvignon, Cabernet Franc, Claret and Syrah from estate vineyards. The wines are generally available only through Constant’s mailing list. Freddy Constant died in 2014.