The ring is always greener on someone else's finger. As summer arrives and sleeves grow shorter, young shoppers are making their way to Seoul's Jongno jewelry district to find the perfect jade ring. Jade, or "ok," long seen as a gemstone for older generations, is enjoying an unlikely revival among Generation Z. Affordable, unique and tinged with vintage nostalgia, the rings have become a sought-after accessory. Although online retailers promise fast delivery, many prefer to browse in person. Bec