A native of St. Petersburg, Russia, who’s been making private-label goods for some of the world’s best-known design houses is now making his own name. Leon Megé crafts mostly platinum jewelry with rare stones like French-cut diamonds. On the 14th floor of a circa-1912 loft building, in one of architect Bertram Grosvenor Goodhue’s original workspaces, Megé’s workshop—with an enviable outdoor roof deck and a bank of casement windows that allows light to flood the jeweler’s benches—is as inspiring as the pieces fabricated within, which includes American Gem Trade Association Spectrum Award–winning platinum and Paraiba tourmaline rings from 2010 and 2012.“I picked the site name ArtOfPlatinum.com even before I opened my company because I love working with the material so much,” Megé says.In 1987, at age 25, he departed Russia for New York City, putting his limited jewel