2412 Rice Blvd., HoustonIn the heart of Houston’s Rice Village, a charming shopping district with the soul of a small town and the diverse retail selection of a big city, sits J. Landa, a 15-year-old jewelry boutique that recently underwent a dramatic transformation. Long known for its stylish and affordable silver pieces, the store, originally called J. Silver, has redefined itself as a designer jewelry destination, complete with decor inspired by Alexander McQueen and Tom Ford—think “bold colors” and “sexy, textured interiors,” says Landa—and a designer incubation program that’s unlike anything the metropolis has to offer.Rice Village ReduxWhen Jay Landa opened his business in 1999, he named it J. Silver to reflect the store’s early focus on, well, silver. He became an early supporter of Chan Luu, whose wildly popular wrap bracelets drew scores of shoppers. But Landa�