Same scene as earlier, Made with Wings3D, rendered with Blender Cycles
No lights in the scene, only sunsky.
Previous version, Blender internal render engine, one point lamp, and AO at .5, Falloff at 1:
1600 X 1200
Many thanks to Peter Draculic for his pearl material/node setup tutorial: [link]
Pretty much followed it to a T, except I deleted the noise node and set both mats to a roughness of zero.
My node setup: