The term geometric is applied to the group of leaded-glass shades with the simplest designs, and includes standard geometric shapes such as squares, triangles, rectangles, ovals, ellipses, and rhomboids used on panel, cone, and globe-shaped shades. Unlike blown shades, the geometric and all ensuing groups were fabricated from pieces of poured glass cut in segments, edged with copper foil and leaded or soldered together to form a complete unit. A patinated bronze finish was then applied to the lead or solder lines. The geometric group is divided into two basic types: shades made from a large number of small glass pieces and those made from a limited number of large glass pieces, such as turtleback tiles and Favrile Fabrique panels.

The transition to flowers group serves as a bridge between the geometric and floral shades. It includes globe-shaped shades of basic geometric design with added botanical motifs. The group is divided into two categories: geometric shades with borders or belts of flowers and vines, and shades with scattered floral or leaf patterns on geometric backgrounds.

Lamps of Tiffany