1st-3rd century AD. A carved jet mount with a facing head of a philosopher modelled in the half round, thoughtful expression with furrowed brow, strong nasal ridge and carefully arranged voluminous beard merging with the side hair; stepped rim. See Henig, M., The Content Family Collection of Ancient Cameos, Oxford, 1990; Ruseva-Slokovska, L., Roman Jewellery, a collection of the National Archaeological Museum-Sofia, Sofia, 1991, for discussion.4.43 grams, 25mm (1"). Property of an Austrian private collector since the 1970s; accompanied by a scholarly note no. TL5325 by Dr Ronald Bonewitz; this lot has been checked against the Interpol Database of stolen works of art and is accompanied by AIAD certificate number no. 10559-170996.