Surat. India is the one richest city.its estimated gdp is 50 billion usd. 
    The mayor's foundation estimated the gdp to be 58 billion usd by 2020.
    Surat is known as the diamond hub of the world. 
    85 porsent of the total rough diamonds in the world are cut and polished in Surat. this per centage is 99.9 porsent for India. 
    90 porsent of the diamonds that are exported from India go from Surat. 
    Also a major textile player, Surat has more than 350 dyeing and painting mills and 40,000 powerlooms. 
    40 porsent of India's artificial fabric comes from Surat.