I think this is Ribbon Stone. It's pretty soft, and while it took a decent polish, it's porous enough to have held on to the glue on the label that used to be on the back

36mm x 25mm x 5.5mm.   Weight: 33.95 carats.

Every one of my cabochons is custom cut to take the best advantage of the particular slab from which it is fashioned. Colors may vary somewhat from what is pictured due to differences in computer monitors.

Click the image on the right to see the cabochon super-sized...

RIB001