Many deals are finalized by a simple, traditional blessing ("", which means "luck and blessing") and handshake. Retailers with shops line the streets outside. At 50 West 47th Street is the Gemological Institute of America which trains gem dealers. One distinguishing figure of the district is the diamond-motif street lights illuminating the corners. The NYC Diamond District also holds three prominent trade interconnected buildings: the 580 Fifth Avenue Exchange, the DDC, Diamond Dealers Club, and the International Gem Tower. It is also close to other landmarks such as Rockefeller Center and Radio City Music Hall.