Like the rest of the state's handicrafts, the glass works of Pratapgarh are unique in both design and usage. Besides beautiful and traditional items such as handicraft items, glass photo frames, trays, glass art ware, glass jewelry boxes, lamp shades, flower vases, crystal wine glasses, flasks, glass pots, antique crystal chandeliers, glass coasters, glass lamp shades and glass paintings, Pratapgarh is renowned for its Thewa work.Colored glass base, embossed with golden miniature artwork is the special attraction of the Thewa work. Floral patterns are etched on gold foil and superimposed on glass moulds and the glassware is cast in such moulds. Thewa pendants are famous pieces of jewelry and their blazing hues and exquisite patterns attract women across the world.

Thewa is a traditional art of fusing 23K Gold with multicoloured glass. The glass is treated by a special process to have glittering effects, which in turn highlights the intricate gold work. The whole Thewa piece is hand crafted over a period of one month by skilled artisans. Thewa, an art that pulsates with life, caught seemingly in movement, in motifs used on jewellery, which shows the culture, heritage and tales of romance and valour of Rajasthan with nature and happiness depicting the art of the fine craftsmanship.

The process of making thewa work is detailed; time consuming and intricate, taking up to a month to complete each piece. It starts with broken pieces of terracotta, finely ground, mixed with chemicals and oil to produce a thick paste. The paste spread on a wooden base has a 23carat gold sheet of 40gauge thickness set onto the mixture and the free hand design etched on it. Black paint spread over the gold sheet that highlights the design so it becomes clearly visible for further detailed work with fine tools. The craftsman removes the excess gold creating a design often based on the Hindu mythology or Mughal court scenes, historical events or with fauna and flora motifs.

Shree Nathu ji Soni invented the process; the secrets of the craft that passed directly from father to son over the generations remains it in the family only, who call themselves 'Raj Sonis’. Many of the members from this family have been awarded by UNESCO, National & State Goverment. Some of the finest examples of this unique form of decorative art are in local museum collections in India as well as abroad including the Metropolitan Museum of Art and the Victoria & Albert. This anicent art is also manage to secure place in "Encyclopedia Britanica".