18th-19th century AD. An ellipsoid blue-grey chalcedony gemstone with one dressed face, reserved icon of a bearded and nimbate saint (St. Peter?) with long hair, right hand raised in benediction and left arm cradling a bible; reverse unworked. 15.6 grams, 36mm (1 1/4"). Property of a Bristol collector; formerly part of his father's collection formed between 1960-late 1970s.