Here's a large-ish freeform cut cabochon of Abalone Shell. Looks very colorful as light moves across it; reflections on the surface move in the opposite direction as the flash in the cabochon.

These were photographed on an Obsidian slab since I was in a remote location at the time, away from my photography "stuff" at home.

37mm x 32mm x 7mm.   Weight: 16.45 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...

ABA001