The 16-acre Gemstone vineyard is truly a study in terroir. Situated on a gradual, west-facing slope in the Yountville Appellation of the Napa Valley, the vineyard has gravelly alluvial soil layered over sandstone bedrock, avoiding the vigor of deep, rich soil. 18 different blocks within the vineyard are planted to five Cabernet Sauvignon clones. All of the vines are densely planted on a variety of rootstocks carefully matched to the soil; each clonal block is farmed separately. The blocks are fermented individually as well, yielding a distinctive palette of fruit and flavors from which Gemstone wines are born.