Intelegence branch of customs conducted drives at Apan Jewellers’ Gulshan, Uttara, Mouchak and Simanto square branches in the capital on Sunday.
The officials sealed the Gulshan outlet as they found it shut during the raid.
VAT officials and members of Rapid Action Battalion (Rab) also joined in the drive. The law enforcers are conducting the drive to know the source of money, said DG Moinul Khan.
They will investigate to know the legal source of gold and diamond, he said.
They will also investigate whether they are paying vat regularly.
The custom detectives also wanted to know to Bangladesh bank to show all money exchange documents of the jewellers.