In 2002, just two years after being listed in the National Register of Historical Places (NHRP), the Jewel Box underwent a $3.5 million renovation.

Due to high levels of smoke and soot within the city, he began a survey to determine which plants could survive the conditions.

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.

The design also included three reflecting pools south of the structure, along with a network of footpaths connecting the greenhouse to Forest Park's existing pedestrian routes.

The value of this innovative design was proven during a 1938 hailstorm that broke more than 1,000 glass panes in adjacent, glass-roofed greenhouses while the Jewel Box stood undamaged.

In 1993, the City of St. Louis began work on a master plan to renew Forest Park and preserve it for future users, while meeting the needs of present families.

The Campaign was adopted in 1995 and would be enacted over the following 10 years, costing $86 million, with hopes that all major construction be complete by the 100th anniversary of the 1904 St. Louis World's Fair.

This renovation included removing all of the old vegetation and reconfiguring the planting areas to the sides of the building, leaving the interior free and flooding the Jewel Box with sunlight.

There are special floral shows at Christmas, early spring, Easter, Mother's Day, summer, and fall.