A decade ago, I attended a press event at the New York City showroom of JCK Las Vegas exhibitor Gumuchian, where I was asked to place my business card in a bowl for a chance to win a Tahitian pearl and diamond ring valued (at the time) at around $4,000.I’d never so much as won a bingo game before, so you can imagine my surprise when I received a phone call later that afternoon saying I’d won the ring. I was four years into writing about the jewelry business and didn’t own a single truly fine piece of jewelry (at trade shows, I was paralyzed by choice). The yellow gold cocktail ring, designed in a flower motif with a 16 mm pearl at its center, gave me a feeling of legitimacy.My prized Gumuchian ring, which you’ll almost always see on my handI’ve worn it nearly every day since, which, I suppose, qualifies it as my most prized possession. We asked four fashion designers to reveal