The agency said the jewellery was "brought from Dubai" and has been seized under the Prevention of Money Laundering Act (PMLA).
The agency has also charged 16 other entities, besides Choksi and his companies.
Central Bureau of Investigation (CBI) found their involvement in the Rs 140 billion fraud related to group of companies belonging to Nirav Modi and Mehul Choksi
PNB issued over 1,200 fraudulent LoUs to Nirav Modi firms since 2011, of which around 400 were issued during the previous government's regime
The agency had last week approached the court seeking its nod to question some of the accused, arrested by the CBI
CBI had asked him to appear before it for questioning in connection with first FIR in which Choksi is named as an accused
Choksi said he was travelling "abroad for my business" and had embarked on the journey before CBI filed an FIR against him
Over the past two weeks, banks have become very cautious about lending to the segment and steps are being taken to ensure that credit is given only to genuine exporters