Bosana Olives This page first published: Aug 2, 2004 · Updated: Jun 7, 2018 · by CooksInfo. Copyright © 2021 · This web site may contain affiliate links · This web site generates income via ads · Information on this site is copyrighted. Taking whole pages for your website is theft and will be DCMA'd. See re-use information. Bosana Olives are medium-sized olives, with 17 to 18% oil content. They are used primarily for oil. The olives are harvested when they are deep purple. History Notes Native to Sardinia, Italy.