I think this is Porcelain Jasper. The gray areas you see are opaque. The white thing in the center that looks like a bullet wound is probably some very old damage to the stone which has almost entirely healed over.

40mm x 23mm x 6mm.   Weight: 41.70 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...

PRJ002