A 17th century carved circular carnelian intaglio

A 17th century carved circular carnelian intaglio, depicting a Christian scene with a seated figure holding a cross and a chalice. 1.8cm wide. A 1st to 2nd century AD carved oval intaglio depicting Zeus. 1.2cm high. A 3rd to 4th century Sicilian carved intaglio depicting a warrior. 1.5cm high. And two 17th century carved intaglios of warriors wearing helmets. 1.8 and 1.2cm high.