Volos Olives This page first published: Aug 2, 2004 · Modified: Jun 8, 2018 · by CooksInfo. Copyright © 2020 · This post may contain affiliate links · This blog generates income via ads · Volos is a style of prepared Greek black olive made from Conservolia olives. The large, oval olives are allowed to fully ripen to a deep purple on the tree. They are marinated in oil. Vólos is a city in Magnisia, Thessaly, Eastern Greece.