Glass medallion with the bust of a woman or goddess

Translucent deep purple, appearing opaque black.
Oval, with deep relief on upper surface, and flat, smooth back.
On a plain background, a female bust, facing front, with head turned slightly to left, wearing a diadem on her hair parted at center and with locks or veil headdress falling behind shoulders, and drapery on shoulders and across chest; narrow frame, comprising a banded scallop design, interspersed with small beads, forming eight roughened areas, each with a central six-pointed star.
Broken with part of top of frame missing, and nose of woman also missing; dulling, small patches of brilliant iridescence, and faint brownish weathering on back.
Despite its small size, this molded glass object has finely worked details, both on the central bust of a woman or goddess and on the ornate raised oval frame. It was presumably intended as a decorative appliqué for a piece of jewelry, possibly even a diadem or ritual headdress.