Description: Early 3rd century AD. A fine blue-grey glass cloison with intaglio profile imperial bust, bearded and with laurel wreath, probably Emperor Caracalla (198-217 AD), with straight nose, furrowed brow, deep-set eyes and facial features as typically seen on his coinage; set in a rare iron finger ring bezel. Cf. Chadour, A.B. Rings. The Alice and Louis Koch Collection, volume I, Leeds, 1994, item 146 for type; cf. Sear, David, Roman Coins and their Values II, Spink, 2002, no. 6828 (and others) for portraits on coins. 15 grams, 29mm (1 1/4"). Property of a Mayfair, London, UK, ancient art collector; acquired in the 1970s-1980s. In Roman times iron rings were worn by important people as they were very difficult and thus expensive to manufacture. Condition Report: Very fine condition.