The Indians, working for an exchange company, were arrested in December following a major investigation spanning Bahrain, Saudi and the UAE.
They along with three others are facing trial for allegedly being part of the money-laundering ring that transferred up to 350 million dinar, Gulf Daily News reported.
They have been charged with hiding data, failing to provide registers documenting the company's transactions and providing Central Bank of Bahrain (CBB) with false information, in addition to money-laundering, illegal transferring and forging documents.
A relative of one of the suspects asked the Indian Embassy to intervene during the monthly Open House held yesterday at its headquarters in Adliya.
"We will try to push for consular rights and allow access to families for the 12 Indians arrested in connection with this crime," said Indian Ambassador Mohan Kumar.
He said they could not interfere because of the nature of the crime, adding they "respect the Bahrain law".