Duty-free import of goods is allowed for the units situated under an SEZ for the purpose of export only, he said.
"As per the probe, we detected a difference in the declared stock value of diamonds/pearls in the SEZ units in comparison with the ascertained actual value of the same. This clearly indicates that certain stock of these goods have been diverted to domestic tariff area," he said.
Separately, firms of Modi and his uncle Mehul Choksi are being probed by various agencies like the CBI, the Enforcement Directorate (ED) and the Serious Fraud Investigation Office (SFIO) in connection with the alleged multi-crore PNB fraud case.
Referring to the Surat SEZ case, he said, "It has been noticed from scrutiny of the documents available that goods worth Rs 890 crore (approximately), involving customs duty of around Rs 520 million, appear to have been diverted by the SEZ units of the Nirav Modi group of companies to the domestic market."
He said the agency arrived at the value of the goods by collating various documentary evidence.
"The DRI is currently ascertaining the year and the exact quantity of the diverted goods," the official added.
In 2014, the DRI had registered a similar case of customs duty evasion against three SEZ companies (Firestar Diamond International Private Ltd, Firestar International Private Ltd, and Radashir Jewellery Company Private Ltd) of the Nirav Modi group in Surat, and launched a prosecution against them under Customs Act, 1962.
The companies had paid Rs 482.1 million towards customs duty along with the interest and penalty in the 2014 case.
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