Gitanjali Gems Ltd., a major Indian jewelry retailer, collapsed in 2018 due to a $1.4 billion fraud involving Punjab National Bank (PNB) orchestrated by its founder Mehul Choksi and associated individuals including Nirav Modi. The scam exploited fraudulent Letters of Undertaking issued by PNB, enabling Modi to misappropriate funds without collateral. This ethical violation led to significant financial repercussions, loss of customer trust, and broader impacts on the banking and economic landscape.