The Jewel Box also known as the St. Louis Floral Conservatory and the City of St. Louis Floral Display House is a greenhouse located in Forest Park, St. Louis, Missouri. It now serves as a public horticultural facility and is listed on the National Register of Historic Places (NRHP). The Jewel Box consists of 16,664 square feet (1,548.1 m2) of plate glass in over 4,000 panes, set in wood and wrought iron supports. Most of the glass is framed by copper with a verdigris patina. The Jewel Box is supported by eight fixed arches, which carry the structure's weight. There are also triangular trusses between every other arch. The ceiling is composed of wood planking. The Jewel Box's entrance is a vestibule made of limestone. Inside the greenhouse, there is a concrete-floored balcony located across the south end. A reflecting pool lies in front of the Jewel Box's entrance.