1258 Fifth St. NE, Washington, D.C. Shelter, a fine jewelry, gift, and accessories shop that debuted in D.C.’s trendy Union Market district last year, has the feel of a serene and stylish fashion boutique. But just beyond its tastefully glassed-off back wall is a full-fledged jewelry workshop where owner Mallory Shelter is often perched, at work on her namesake collection. Mallory Shelter opened the shop in a former wholesale-industrial space across the street from Union Market—a local hot spot featuring artisanal food stalls—to retail her collection and highlight contemporary jewelry designers that weren’t formerly stocked in the nation’s capital. “I knew there wasn’t really a jewelry store in D.C