Just two days after Mukesh Ambani was ranked India's wealthiest for 8th year, Pharma tycoon Dilip Shanghvi Wednesday surpassed the Reliance Industries chief as the world's richest Indian, according to a 'real time' update from Forbes. With a net worth of $21.5 billion, Shanghvi elevated to 37th position on the global rich list, while Ambani ($20.4 billion) slipped to 43rd.