Bezel : silver 925 black plated. 
Leather chain included with pendant . 
Severus Alexander. AD 222-235. AR Denarius (19mm, 3.31 g, 1h). Rome mint. 10th emission, AD 229. Laureate bust right, slight drapery / Annona standing right, left foot on prow, holding modius and rudder set on globe. RIC IV 190; BMCRE 597; RSC 32a. EF, lustrous.
IMP C M AVR SEV - ALEXAND AVG.
ANNO-NA AVG.