This is a button is hand beaded jet used as an embellishment from the 1870's era. It is a faceted jet sphere with a double thick saturn ring of black seed beads. It has one stray thread which was its hanging loop. It measures 1 1/4 " across and 3/4" thick. It was handmade for some garment. My mother gave it to me but I do not know the back story. I always thought it would be a nice addition to someone doing traditional Victorian costumes.