Joanne Ooi Plukka  plukka.com facebook.com/plukkajewelry Instagram/Twitter: @plukka  “I want to be the Sephora of jewelry,” says Joanne Ooi, founder and creative director of online fine jewelry retailer Plukka. “Sephora only does cosmetics and they have their own stores—and their expertise is peerless.” The aspiration is, of course, sky-high. But Ooi, a longtime brand and marketing expert who divides her time between Hong Kong and Suffolk, England, is undoubtedly on her way to building something big, and eventually even disruptive, within the jewelry industry. Plukka debuted as an innovative flash-sale site for high-end, one-off fine jewelry. But in 2014, Ooi rebooted the company as a clicks-and-bricks jewelry firm, albeit far from a traditional one. Plukka, which has hosted a series of high-wattage pop-ups in major cities since launching, currently h