The agency has also arrested two employees and an auditor of the Nirav Modi group of companies, while a director of the Gitanjali group of companies (owned by Choksi) has also been taken into custody.
Reacting to the development, shares of Gitanjali Gems slumped 5 per cent, to hit its 52-week low of Rs 19.30.
On the NSE, the stock fell to a 52-week low of Rs 19.25.
The CBI has also arrested the then director of Mehul Choksi's company Gili India, Aniyath Shiv Raman Nair, in connection with the case.
Besides being one of the directors of the Gitanjali group of companies, he was the authorised signatory for the applications submitted to PNB for issuance of purported Letters of Understanding (LOUs) and Foreign Letters of Credit (FLCs), CBI said.
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