The People's Supreme Procuracy, Vietnam's highest prosecutorial office, has leveled drug trafficking charges against five people, including two foreigners.
If convicted, members of the ring may face a firing squad.
Prosecutors said the trafficking ring, led by Chime Chidike Ben, 34, and two other Nigerians smuggled drugs from India to Vietnam en route to China.
The indictment also implicated a Filipino named Tersita Guiyab Nepomuceno, 34, and three Vietnamese from Ho Chi Minh City Luong Thi Kim Dung, Nguyen Thi Hanh, and Nguyen Thi Mai.
Investigations charged that the ring trafficked over 1,021 grams of heroin by hiring women to transport the drugs in buttons, shoes and books.
The arrests were made on June 18, 2009 in a joint effort between the Ministry of Public Security's drug crime investigators and Hanoi police.
The agencies raided the local Golden Time Hotel and seized 11 skirts featuring three-centimeter buttons concealing more than 871 grams of heroin.
Vietnam has some of the world's toughest drug laws. Trafficking more than 600 grams of heroin in Vietnam is punishable by death.