This is a gorgeous set of vintage pieces! You get one oval cabochon that measures 20x15mm.....it is made from black glass and has an applied mottled Green comedy/tragedy mask in it's center. Also included are two matching comedy/tragedy masks, both in the same mottled green color and measuring 11x10mm. Now, these pieces COULD be made from Black Onyx and Makachite.....but as I don't know for certain, I am going to call it glass. Gorgeous, regardless of what they are made of!
