Prime Minister Narendra Modi on Monday inaugurated a diamond manufacturing unit in Gujarat's diamond city Surat. The project that costs Rs. 500 crore has been undertaken by the diamond merchants of the city for people's welfare. PM Modi arrived here on a two-day visit yesterday. This is PM Modi's second visit to his home state this year. He had visited Gandhinagar on March 8 to address women sarpanchs from across the country on International Women's Day.