Is Ashes & Diamonds a style statement? The winery, with its retro mid-century modern look, starkly un-Napa white walls, and low-key lounging spaces, definitely says yes. A magnet for millennial wine lovers, à la Sonoma’s Scribe Winery? Yes on that, too... But most importantly, it’s a source for organically farmed wines that hark back to the lower-alcohol, more restrained California style of the 1960s and 1970s, made by wine-world stars like Steve Matthiasson and Diana Snowden Seysses.