The incident took place in February 2012 at a jewelry exhibition in St. Petersburg.
The suspects were detained after they tried to travel to Colombia with jewelry, cash and other times.
Earlier this week, a court in St. Petersburg handed down sentences ranging from 2 1/2 to 4 years to seven defendants, RIA Novosti said.
Last week, another Colombian national, Frank Israel Prieto Avila, who was identified as the leader of the group, was sentenced to four years in prison.
In mid-August, two other Colombians were convicted and sentenced for the crime.