Up for sale is an antique Chinese adjustable ring.  The metal, I think,  is brass, and the floral shaped stone is quartz.  The metal is filagreed, and the additional decoration is enamel.  My mother purchased this ring at an antique shop---at least 25 years ago now, and wore it upon occasion.  It came to me, but I have never worn it - just have kept it stored in a smoke free home since.  Please look carefully at the photos and feel free to ask questions!