Here we have an antique pendant, etched in  glass with a brass bail. very detailed, classic Victorian piece, with a beautifully detailed profile is a feathered headdress, typical of Grand Tour jewelry. 

The color is a rich brown/amber, glow beautifully in the light. Original top loop intact, and an excellent antique patina.

Flat in the front, curved in the back, about 30mm diameter. Really lovely, unusual piece.