I bought this at a Sunday market during a trip abroad. I originally planned to make a lampshade with it, combining it with stained glass, but I didn't have time to go to classes due to work and childcare, so I've kept it stored in a box for about 10 years. I don't know the specific type of agate. There's a bit of what looks like tape residue on the surface from when I bought it, but I think it will come off with alcohol. The chip in the center is due to the original shape of the stone before it was cut. I cannot sell individual pieces.