The accused imported 25 kg gold duty free in the last eight months claiming to use it for manufacturing and exporting jewellery.
"Instead, they used only 10 per cent of the gold in the jewellery and the remaining 22.5 kg gold was used by them in the domestic market," a DRI official said.
"By doing this, they evaded tax of Rs 73 lakh," he added.
The DRI team examined papers and got some pieces of jewellery, which were being exported, tested which confirmed that only ten per cent gold was used.
Gold is duty free if imported for manufacturing gold ornaments for the purpose of export whereas the duty is imposed if the gold is imported to be used in the domestic market.