Colchian-Sinopean relations in the 6th-3rd cent. B.C. may be divided into three periods.
In the first period – end of the 6th-mid 4th cent. B.C. – Sinopean coins were in circulation only in the south-western part, in the coastal zone.
In the second period – mid 4th cent.-early 3rd cent. B.C. – Colchian-Sinopean relations reach their highest point: Sinopean coins circulate both in the entire coastal zone and in hinterland areas as well. Stamped Sinopean pottery is imported, being distributed almost all over the territory of Colchis. In the same period amphorae and tiles begin to be manufactured in Colchis, imitating Sinopean production.
In the third period – third quarter of the 3rd cent. B.C. – Sinopean coins are no longer in circulation on Colchian territory. The import of Sinopean ceramic ware (tiles, amphorae) is of sporadic nature, occurring only on the Vani city site. After this Colchian-Sinopean relations generally cease: no import is in evidence, nor are Colchian amphorae manufactured in imitation of their Sinopean counterparts.