A: Along the vertical axis of the gem, from bottom to top: altar, eight-pointed star, crescent open to bottom, modius.
B: Inscription in five lines: χαβραχ|φνεσχνη|φικοφιου|ωφωωχ|ωβωχ → χαβραχ-logos.
Bibliography
Henig - MacGregor 2004, 127, no. 13.26