
The couple are Tran Van Hai, 39, from Yen Bai province and Nguyen Thi Thu Thuy, 46, from Lao Cai province.
The couple did not have any document proving the origin of the gold.
They said that they were transporting gold from China to Vietnam.
The case is under investigation.
On December 16, customs and police officers in the southern province of An Giang also seized 15kg of gold, transported by two men from An Giang to HCM City.
Gold smuggling is on the rise when the price of gold in Vietnam is much higher than in the international market. With 25.5kg of gold, smugglers can earn up to VND1.2 billion ($60,000) of profit.
PV