Martin Katz's by-appointment-only 18th floor salon is cozy, relaxed, and home to many an exquisite gem. Peruse his collection of tailored art deco estate pieces or be dazzled by his original designs. Martin Katz has jeweled 200 stars for the Oscars, Emmys, and Golden Globes. Nicole Kidman started the fad for antique Indian jewelry with his 18th century Mogul Indian suite a few years ago. He also designs couture-style pieces that are micro-paved in Paris, influenced by Verdura and Schlumberg. Pins from his Nature Collection are a specialty--ruby strawberries dangling from a vine, a tulip whose bud twists off and switches from emeralds to sapphires, a necklace of green garnet ivy. He almost puts nature to shame.