Diamond Creek Vineyards is a wine producer located in the Diamond Mountain sub-appellation of Napa Valley. It was founded in 1968 by Al and Boots Brounstein, and it was the first winery in California to exclusively produce wines made from Cabernet Sauvignon. Today, it produces Cabernet Sauvignon from four different vineyards in Diamond Mountain.
Al, the former owner of a successful pharmaceutical business in Los Angeles, got into wine when taking a class at UCLA on French wine appreciation. After working a few harvests at Ridge Vineyards, he decided that he wanted to have his own property. He visited a then unplanted property on Diamond Mountain, and after consulting with the famed Andre Tchelistcheff and Louis Martini, he purchased the property and planted it all to Cabernet Sauvignon.