The market for same-sex marriage and commitment jewelry heats upWith same-sex marriage now legal in nine states as well as the District of Columbia, and with the issue likely to be addressed in the near future by the Supreme Court, wedding jewelry for same-sex couples is moving from a niche market into the mainstream.“We’re definitely seeing an uptick,” says Matthew ­Rosenheim, president of Tiny Jewel Box in Washington, D.C. “Gay ­marriage passed in the district, and we’re starting to see people take advantage of it. A lot of people come in excited to celebrate the fact that they can get married.”As a growing—or possibly still untapped—demographic, same-sex wedding jewelry is an area designers and retailers say they can’t afford to overlook.Tradition Meets the UnconventionalRing in 18k yellow and 18k grey gold mokume gane, 22k gold, and 0.80 ct. diamond; $8,500; Pierr