This Antique micro or mini Mosaic hat pin is exceptional. It is a diamond or tilted square shape that has a raised, pointed center. The shape is a four sided pyramid, or tetrahedron. The colors are all a red, white, and blue, with tiny star tiles on each side and the very top. I have not tried cleaning this antique piece at all. It is not signed on the back and the stick is slightly bent. None of the glass pieces are missing. Please view all the photos, it is truly a rare style.