A: Enclosed within a human-headed Ouroboros, wearing a crown with horns and solar disk (Isis-crown), and winding inward: Sarapis sitting enthroned to left, his right hand touching a scorpion at his feet, his left hand resting on a tall scepter. Above his head, a scarab with outstretched wings. The throne of Sarapis rests on the back of a crocodile, facing left. Below the crocodile: lying Osiris-mummy with atef-crown, head to left, carried by a roaring lion walking also left. In the free field to the right of Sarapis, a small lying crescent, and an eight-pointed star above it. Below these, inscription in three lines: αεηι|ουω|ω → vocales including the Greek vowel series. Inscription around the edge, outside the Ouroboros, beginnig at the top: ιαεωβαφρενεμουνοθιλαρικριφιαευεαιφιρκιραλιθονυομενερφαβ → Ἰαεωβαφρενεμουνοθιλαρικριφιαευεαιφιρκιραλιθονυομενερφαβωεαι">Ἰαεω-palindrome.
B: Harpocrates sitting with knees drawn up, facing left, on a lotus flower with two buds. Baseline indicating primeval mound? Head crowned with the sun disk, side-lock of youth falling on the neck, right hand raised to mouth, left hand holding a flail. In front of him, an eight-pointed star, behind him, another eight-pointed star and a crescent. Inscription around the edge, consisting of characteres and some Greek letters, beginning to the right of the flail: ωχηχωυζελ → unidentified voces.
Based on similar representations, in which Sarapis leans on a scepter with an ibis at the top, and a passage in the Greek Magical Papyri (PGM V 446ff.), S. Michel raises the possibility of Sarapis being identified with Thoth here, also mentioning the deity’s possible identification with Zeus/Hades and Kronos.
On the other hand, the representation of Harpocrates on a lotus flower connects the gem with love charms. A praxis known from a papyrus (PGM LXI 1-38) specifies that love charms had to be incised with the image of Horus on a lotus flower and the magical name Abraxas. Pieces with the Horus-scheme used as love charms: CBd-533, CBd-534.
Bibliography
Bonner 1951 on CBd-663
Michel, BM on CBd-663