This lampshade style is called a "Desert". It is oval shaped at the bottom with 8 vertical ribs and custom shaped bottom. 

It is lined inside with silk -- the finest fabrics and trims of your choice will be used in making this beautiful piece.

At the bottom of the shade, it measures 22" x 14.5". Overall height with a 7" fabric fringe is about 15".  Great size for a floor lamp or large table lamp.