Sterling 2016 - Vineyards Iridium Reserve Napa Valley Cabernet Sauvignon is one of the rarest elements on earth. A very constrained and expensive resource, Iridium's uniqueness makes it incredibly valuable. Like the element, the Sterling Vineyards Iridium Cabernet Sauvignon is treasured. Made in only the very best vintages with the finest and most intense expression of Napa Valley Cabernet Sauvignon, Iridium is the pinnacle of winemaking perfection.