This is an edifice with four Ivans and the most stunning stucco work. It is one of the country’s most significant historic buildings for its large size, brick dome, plentiful ornaments, mosaic tile work, historical inscriptions, and various styles of calligraphy.
A variety of stucco work with plant, Arabesque, and geometric motifs are combined here to make this a distinctive work of art. Every motif is filled with more patterns, leading to an incredibly varied number of designs. Islamic designs are not the only ones used here.
The oldest ornaments are of Persian art and design, such as the icon peace sign of the Broken Cross (Chalipa), which has been combined with the art of the Islamic era.
It is said that French archaeologist and Iranologist, Madame Dieulafoy, visited many places in Iran. She traveled to Ray during the reign of Nasser-e-Din Shah and visited the Varamin Grand Mosque, calling it one the most magnificent historic sites.
Source:Tasnim
